Hans thank you,
I did talk with Sierra last week and they gave me a website to go to so I could read/study the installation instructions and I did that, now the smart thing would have been to save that to my favorites (key phrase "would have been").
The poles are the number of magnets on the rotor (looked at some used ones on ebay to get a count), looked like 18 which corresponds with your count of 6 per phase.
But in order to go that route you must tap into the ac side of the alt. before the diodes convert ac to dc , which means peeling that side of the engine apart to solder in a lead and bring that to the outside unless the alt. has a ac tap (don't think it does).
Then set the alt. switch to highest pole count which is only 16 and use the tach. adjustment screw to hopefully get it on the money....
Kinda complex but might be possible, maybe.....
My first choice would be the cam position sense wire (I believe it shows 4 pulses) then set the tachs number of cyl's. to 4 and it should read correct , again hopefully....
Second choice would be DIY tach adapter using the instructions in your earlier post but I think the #cyl. switch comes into play on that one as well.
The price you saw is not what I'm getting it for , I can get it at cost (my friend owns the marina :thumbup
which makes the experiment
much more worth trying (its the sisu in me).
What is AFAIK ? I couldn't figure that one out and its killing me to know :grin2:
ranger4u - thanks as well I did read up on your posts about the VDO's as well they are a good quality gauge and hold up well, still need the adapter thou (think you said its no longer in production)....
I just wanted to have a nice tach of good quality that reads correct and lasts (reason for the experiment).
I will keep you guys posted on progress.
Thanks :bowdown:
This for bouncy tach needles: