VEMS tacho output

[Jeffer]

ANy of the guys in here know wich output you can use on the VEMS ecu to drive a tachometer. In the wiki someone states that you can use I259/7 (EC36 pin 10). This is an ignition driver, divier=01

# Tachometer (I259/7 to M40), 5V signal, divider=01

However i'd like to know if this is truely the right one.
I'm using a 200 dash on a CQ T85 loom with VEMS. Trying to wrap my head around all the wiring.....

[Bram]

I scraped together some comments from the web regarding this issue.

Some old tachometer (RPM) gauges need an extra IGBT output

VEMS will suport a tacho that needs a ground signal, as is, or a 5v signal with a 5v pull up, a 12v signal with a 12v pull up. Some tachos need an inductive pull up, which requires an inductor from the web shop



You can check what voltage your tacho need in order to be controlled from VEMS by e.g. putting on 5v or 12v and see if the needle of the tacho moves.

Most VEMS built units have one pull up resistor onboard, however which channel I am not sure.
Its easy to check if you power up the board, any of the P259 outputs on the EC36 connector that have 12v on them have a pull up resistor installed.
I am not sure if Pin 10 is the only option you have, and I think you could use another green (see below) output pin as well.



HTH

[porkkis]

I have some plug and play vems configs. In those it's P259, 0 and div 16.

[Jeffer]

The plug and play VEMS works on the aan/aby/adu engines. So that one should have the correct tacho output settings. So Porkkis his settings should be the correct one?

[Jaap]

Tacho

If you use a 200 dash, you need more than a 1k resistor.
It could work correct till 1500 rpm.
Then the needle will drop.
But i can be fixed with electronics.
Signal setting in VEMS bust be diveded 5

Grtz Jaap