Tacho install

[kABLiuks]

Hello guys,

Been away for a while, but did a lot of progress, car is fully painted in new color and now playing Lego while assembling

Q: mine is 315, no tacho as we all know. Recently bought original tacho from e21 318, and want to install it correctly. At the back there are two wire + and - as I understand, and another connector has three - black, violet and braun. I suppose they go to engine somewhere, does some one know where to connect those three wires?

Thank you!

[mr edd]

on the back of a late e21 tach you should find a two pin socket for the power for the clock .a socket shaped like a strawberry which connects to the time adjuster button which sits under the clocks at the side of the steering column and a three pin socket which runs the tach...a tacho from a early car only has three pins on the back for the same connector which should only fit one way...edd..

[kABLiuks]

amm, I see that, but where do I conect those THREE pins? Which parts of the engine?

[kABLiuks]

still question is open... any one?

[Mihajlo]

first and third pin are positive and negative.
the middle one is impulse from ignition coil.

but I'm not 100% sure!