Author Topic: Custom tach, which pin #? (Read 4476 times)

christod · « **on:** February 27, 2008, 06:49:15 PM »

Hello everyone,
I've put a custom tach (VDO vision series, black face, dont worry

in my e21 w/ m42. Does anyone know where I can find a guide to the ECU pin #'s?

Cheers!
Chris

Vladi · « **Reply #1 on:** February 28, 2008, 04:41:53 AM »

The thin black wire is the signal for the tach.

christod · « **Reply #2 on:** February 28, 2008, 05:28:52 PM »

Thanks Vladi

xsjado · « **Reply #3 on:** February 29, 2008, 05:40:54 AM »

ive lost all hope to put back the m40 tach to m42 ecu back so now i just rely on the shift light....

christod · « **Reply #4 on:** March 01, 2008, 01:17:19 AM »

Hmm, I'll keep puzzling over it, Ill post if I can get it to work

johna · « **Reply #5 on:** March 01, 2008, 02:08:26 AM »

You can get a rpm signal from the instrument cluster connector. You may need to install a resistor though. "Connect the engine speed input to pin 7 of C1, the connector on the back of the instrument cluster closest to the tachometer."... from http://www.motortraders.net/groups/group.asp?group=1&menu=1&article=15