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Discussion Starter #1 (Edited)
I thought it would be appropriate to start a new thread on this as things have progressed past the original thread, link to that is here.
https://www.vtxoa.com/forums/6-vtx-1800-tech-board/11545-drag-specialties-tach-wiring-help.html

I have finally had success in getting one to work and work well, the tach being a sierra marine tach but it is full size.
It is the heavy duty series part #82288P , 6K tach 3-3/8" all sierra marine gauge faces will withstand 6 psi water pressure and not leak.
However the gauge is open in back to breath so it must be mounted in a gauge cup, I purchased this one.
https://www.autometer.com/3-3-8-mounting-cup-monster-ga-black.html

More on sierra marine gauges can be found at http://v3istruments.com
Using the pulse settings switch on the back I set it for 4P 8cyl. and tied into the cam pos. sensor with a soldered connection on the terminal in the plug under the seat.

There is a potentiometer on back as well and I used it to fine tune the tach but was only able to get it to within 100 rpms of actual, I will check it again when I get the gauge cup and mount it (batteries very weak on hand held tach).
It is rock steady with no needle bounce and very smooth as I throttled up, this tach will not work using the alternator hook up as it only goes up to 12 pulses but I did order the diodes and resistors to do a DIY tach adapter so I will try that as well and post the results.
The tech I spoke with at V3insturments was very helpful and informative (these gauges are made in the USA!)

Now for VDO tachometers - This gets even better!
My friend in the marine biz is trying locate this VDO marine tach, https://www.vdo-gauges.com/instruments-displays-and-clusters/by-type/preconfigured-tachometers/viewline-onyx-6-000-rpm-2-1-16-52mm-tachometer-for-4-cylinder-gas-engines-12-24v-2-pulse-rev-signal.html
They come in 2,3 and 4 pulse versions 899-S-2P , 899-S-3P and 899-S-4P seen here https://www.vdo-gauges.com/instruments-displays-and-clusters/by-type/preconfigured-tachometers.html
these 3 are 100% waterproof so a torrential down pour will not effect them at all period, they are made in Sicily and John at VDO tech support (also very helpful!!) explained that they can be programmed at the factory to however many pulses you like :thumbup::thumbup:
So good bye tach adapters!! (1 pulse = 1 wire & 1 coil ), or for "C" models tach lead in headlight bucket!
These tach are supposed to be accurate to + or - 2.5%, only draw back is no potentiometer for fine tuning...:cus:
I will post more when I do the final hook up and locate a VDO tach :mcrider:
Special thanks to: Drag Specailties ( for extremely poor customer support and cheesy tachs) , Baron Custom accessories (for twitchy jerky unreadable tachs they guaranty to work on a 03 1800c but good support).
:eek:rac:
 

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Hello Mark, interesting info!

Can you provide some detail information on your ECM pin extraction method?
1300 has an issue with wires breaking at the ICM.
Same connector as the 1st gen 1800 22 pin connector.
 

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I am extremely happy with my VDO tach set in the no-longer-available Rivco chromed mount that bolts to the top clamp and sits around the speedo, making it look kinda like a little center gauge cluster. Regular idles @ 900 + rpm, fast idle @ 1600+ rpm, absolutely no needle bounce. Again, many thanks to Chuck VTX F for getting the bugs out, along with Rivco tech support for supplying the little adapter needed to convert a 1300 tach for 1800 use.
 

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Discussion Starter #4
Hans, I will be posting some more info on VDO’s tonight (gets even better) and will get some better pics of how to get the pins out along with the dinky tool I made. It’s not too bad but man they’re in there!
 

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Discussion Starter #5
Pin Removal

Hello Mark, interesting info!

Can you provide some detail information on your ECM pin extraction method?
1300 has an issue with wires breaking at the ICM.
Same connector as the 1st gen 1800 22 pin connector.
No problem, here ya go.
You will need a dinky screwdriver (mine was 1.4 mm from radio shack) or a set of those tiny screw drivers (like for eye glasses) or piece of mechanics wire about .062 I used both and both worked fine.
If you use the wire cut it to about 2" long and grind a bevel on one end (like a wood chisel) on the other end bend a short 90 maybe 1/2", I did this so I could tell which way the bevel was and to catch my finger tip.
Attached is a pdf I made showing a jumbo view of one terminal slot with the rubber gasket pulled back, I tried the screwdriver today on a second term. and it pulled out very easily (it still had the silicone grease on the black rubber sealing ring).
In the last picture with screwdriver I am very gently prying the plastic tab up to unlock the term. as I do that I pull gently on the wire coming out of the plug ( I guess it would be the outside end ) with my other hand, if you have to pull hard then the term. is ether stuck or not unlocked (cam pos. sense wire was stuck, hole was dry but it came out).
When I pried on the release tab I pried against the terminal itself, it takes very little pressure to get it to let go.
I do a lot of RC flying and build my own drones so I had the tools and am used to this tiny stuff.
If a terminal needs to be replaced I don't know where you could get one like Honda uses but.... I checked today and a female servo terminal will fit on the ECM male pin and does pass through the slot in the plug (just can't lock it into the plug) I included a picture of one.
You would have to put a short lead of wire on the terminal then push it onto the corresponding pin on the ECM and feed the lead through the plug making a soldered connection outside the plug to the original wire.
These female pins. https://www.readymaderc.com/products/details/irc-male-connector-with-female-pins-5-pcs

Best of luck Hans !!!
 

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As Arte Johnson used to say on Laugh-In....."Veeeelly eeentellesting!"
 

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Mark is it ok to use your text and pix to create a PDF?

I have complied a few docs and created a few PDF.
I have them in the Step by Step section.

I went to Bareasschoppers to get the link for terminals.
You could probably nail down the exact pin used.
Pin latches, either a small tab on the terminal or a hole and the connector body has the latch.
http://www.cycleterminal.com/index.html
 

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Discussion Starter #8
Mark is it ok to use your text and pix to create a PDF?

I have complied a few docs and created a few PDF.
I have them in the Step by Step section.

I went to Bareasschoppers to get the link for terminals.
You could probably nail down the exact pin used.
Pin latches, either a small tab on the terminal or a hole and the connector body has the latch.
http://www.cycleterminal.com/index.html
Sure Hans go right ahead :thumbup:
I put another post on this thread early this morning with more info on VDO’s but I don’t see it.....
Hmmm, I must have done something wrong so I’ll redo it tonight :surprise:
Thanks for the link! I’ll check it out tonight :thumbup:
 

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Discussion Starter #10

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Discussion Starter #11 (Edited)
More on VDO Marine Tach's

The vdo tachs in a earlier post of mine (tach # 899-S-2P) are very spendy they retail for just over 200 bucks, and the "at cost" price is too steep for me as well.... Also they cannot be found anywhere online.
I did call John again at vdo tech. support and found some alternatives , the "vision black series" https://www.vdo-gauges.com/instruments-displays-and-clusters/by-series/vision-black/vision-black-6-000-rpm-2-1-16-tachometer-12v.html
Its tough to to find a small marine tach ( 2 1/16 " ) but this series has it.
He went on to explain they have a IP67 rating which means the gauge face can be submerged to 1 meter for 30 minutes and not leak, I asked how about a driving rain or torrential down pour ? He said it would be fine the gauge won't leak however.... the back of the gauge is open so it must be mounted in a cup to protect it (thinking of a handle bar mount).
The real good part is that there are many ways this tach can receive a pulse or signal, instructions here- https://www.vdo-gauges.com/media/instructions/0%20515%20012%20044%20--%20Tachometer%20without%20Engine%20Hour%20Meter%20(52mm%20Diameter).pdf
This one can tie into the vtx alternator, cam position sensor, and coils (with the right adapter) which I'm working on :grin2:
It also has a potentiometer on the side for fine tuning and is accurate to 2.5% ( he says 3% about the width of the needle).
A quick search showed amazon had the best price of 100 bucks so I have my marine friend looking into one for me and hopefully that one will pan out.
He went on to say that vdo makes the gauges for Indian and HD , so it looks like vdo has something to offer for a good quality gauge in small scale that can be used on our bikes without having to deal with sooooo much bs.
I did get my jumbo tach mounted tonight and will cover that in another post to this thread :thumbup:
Stay tuned kids!
 

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Discussion Starter #13
"The Jumbo"

Well its in... I had to shoehorn it into place and it is a tight fit but I'm really liken it! :pepper1:
It has great lighting is easy to read and now with a solid electrical hook up there is virtually no error - wooo hoo :thumbup:
The bar I mounted it on is temporarily bolted up to the bottom of the risers and I did shim the gauge cup up 1/4" after the initial install, their are before and after pics of that.
I also had to remove one of the cap nuts on the windshield to gain some room (replaced it with a nyloc) , it sits at the same angle as the speedo so it looks almost factory like.
I drove the SR71 to work tonight (yeah the VTX) and the tach is very smooth no jumps or twitches, sure is nice to see what rpms I've been cruising around at...
I'll still experiment with the small tach if I can get it but I'm liken jumbo a lot! :grin2:
Also included a pic of the SR71 guard "Herman the brown eyed German"
 

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Discussion Starter #15

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Discussion Starter #17 (Edited)

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If your MC did not have a VSS then magnets would be used with a coil pickup.
I believe someone placed the magnets inside the bolt heads of a brake disk
on another MC. One gauge for all of the necessities.
 

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Discussion Starter #19
Tach. Adapter and Tach

The jumbo tach is now a permanent install, and I'm very happy with it and will not be changing over to a smaller one. The VDO tach. #333-158
I cannot get reasonable enough just to experiment with, however they are available https://www.jegs.com/i/VDO/918/333-158/10002/-1
The VDO's have two ways to hookup without an adapter (Alt. and Cam pos. sensor)

I did make a adapter to tryout running off the coils using the PDF guide Hans&Feet posted earlier, I used 47K resistors for the adapter and it did work but had minor needle bounce at idle and read 150 RPM'S low.
The bounce disappeared at any rpm above idle and tach worked smoothly so I've ordered smaller value resistors and will give it another shot.
For ease of install the cam pos. sensor is the way to go.

So the Sierra (made by V3 electronics) or the VDO's show the most promise (both are marine) IMO as far as analog goes...
Both company's have excellent customer support :thumbup:
As fastspec mentioned in another thread Dakota Digital has very nice digital tachs (made right here in the USA) :pepper1:
 

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You could try a .01ufd capacitor or a .1ufd cap at the tach wire to ground to see if the bounce will go away.
Use 400v rated cap.
The charge>discharge will make the pulse less spiky.
 
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