Kodachrome 158 Report post Posted December 9, 2021 Just got my M54b30 powered e28 on the road, couple of small bits left. One of which is the tachometer. I just need to connect the m54 to e28 harness engine speed wire to Pin 1 of c104, according to instructions. Rhd car, where is c104.. Lot of wiring going on in my glove box! Quote Share this post Link to post Share on other sites
Kodachrome 158 Report post Posted December 12, 2021 I figured this out, it's a 3 pin connection like the e24 and w12 in my early e28. Black is tacho. White & black is presumably econo guage. Quote Share this post Link to post Share on other sites
