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DISCUSSION => Engine management => Topic started by: christod on February 27, 2008, 06:49:15 PM

Title: Custom tach, which pin #?
Post by: 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

Title: Custom tach, which pin #?
Post by: Vladi on February 28, 2008, 04:41:53 AM

The thin black wire is the signal for the tach.

Title: Custom tach, which pin #?
Post by: christod on February 28, 2008, 05:28:52 PM

Thanks Vladi :)

Title: Custom tach, which pin #?
Post by: xsjado 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....

Title: Custom tach, which pin #?
Post by: christod on March 01, 2008, 01:17:19 AM

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

Title: Custom tach, which pin #?
Post by: johna 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