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  Topic Review (Newest First)
08-28-2019 02:39 AM
Originally Posted by Bikerbob1 View Post
I have a nice little cobra tach that clamps right on the handlebar. It's a little bigger than your clock, and hooks up in the headlight case. Goes up to 8k, but has no redline. In the picture, it's the tach on the right.
Yours is similar to Mark's (OP) VDO tach what this post started about, but since than Lee hijacked the thread , so now it's about how to wire an Acewell speedo/tach. Lee has an 1800 C model and in his case the Acewell unit can replace the OEM speedo and gives a much cleaner look and many extra functions, than an additional tach, if I understand correctly (or at least this is why I replaced my OEM speedoo with an (different model what Lee has) Acewell speedo/tach/etc. computer).
08-27-2019 10:48 PM
Bikerbob1 I have a nice little cobra tach that clamps right on the handlebar. It's a little bigger than your clock, and hooks up in the headlight case. Goes up to 8k, but has no redline. In the picture, it's the tach on the right.
08-27-2019 04:10 PM
ervin260 If I remember correctly, mine has two temperature sensor inputs. Temp.1 display is for engine coolant temperature and I didn't buy the optional sender unit, because the VTX 1800 C already has a high temperature warning light on the dash which is enough for me. Never had overheating problem.

There is another sender unit which came with the speedo/tach and it's connected to the other input (Temp.2). I use that for ambient temperature.
08-27-2019 03:11 PM
Thermo Sensor and sensor tube question

Thanks again ervin260 and Hans&Feet!

From the instructions:

1. the (tach-computer) has (a) temperature sensor BUT
the temperature sensor tube is an optional part;
you might have to purchase a suitable water pipe temperature sensor tube...

2. cut the water pipe,
insert the temperature tube into the pipe and
secure it by attached pipe clamps.

3. screw the sensor into the tube.

4. if the vehicle is fitted with a thermostat that stops water flowing to the radiator when the engine is cold,
you will not get a reading until the thermostat opens.
There are no picture, drawing etc that help me understand the above.
I don't seem to have something that would be a temp sensor to put into a tube to put into the 'water pipe.'

QUESTION- Does any of this apply to installing this tach on the VTX - or is it all electronic and there is no sensor for me to install?
08-26-2019 02:42 AM
ervin260 Hall sensor was included, because not all vehicles have speed sensor. If your vehicle (bike) has one already, it's up to you, which way you go.
08-25-2019 10:58 PM
Next questions: Speed sensor mounting

Ok, that was the RPM sensor mounting questions.
Next, is the Speed Sensor mounting questions.
The instructions are:
ACEWELL has several speed sensors; the (tach/computer) may include one of them.
If the (tach/computer) is intended to be connected to a gearbox electronic speed output to obtain the speed reading,
(then) no sensor will be included.

The Hall sensor was included.

Question one:
Do I use the Hall sensor or connect the tach/computer to the gearbox electronic speed output?

Question two:
If the gearbox electronic speed output is used, then how to connect it?
There are no instructions explaining how to make this connection.
08-25-2019 11:30 AM
ervin260 I'd go with the grey wire version...
Easier vs. better. Your choice.
08-25-2019 10:00 AM
ervin260 thanks for asking. First questions are:

Below I’ve retyped part of the instructions for “RPM sensor mounting” for easier reading otherwise you can look at photo 1 from previous post for the actual instruction sheet.

either the yellow (wire) can be wrapped around the spark plug lead
or gray wire to sense the RPM signal.

If the reading is incorrect
(then) try putting the 1M (ohm) resistor inline in the sensor wire.

If the signal is still unstable
(then) try to connect the gray wire to
either the ECU rev counter output
or to the primary side of the coil
or to the pulse wire on an active spark plug cap.

On a VTX 1800, 2006:
Question 1 - Do I connect either the yellow or gray?
Question 2 - If still unstable then do I connect the gray wire to ECU, or primary side, or pulse wire?

08-25-2019 05:13 AM
ervin260 So, what is the question?
08-25-2019 12:36 AM
LeeW Attached are ten photos of the instructions.
Some pages have two photos: one clean page without my notes, and another page/photo with notes I made long ago.
Just FYI.
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