85e to 89 2.7i tachometer

[hurttech]

Does anyone know how to get the signal from a 1.3 DME to the tach on a older E chassis?

[jlevie]

You need to find the wire in the bundle that has the tach signal and feed it to the connector that attached to the DME cable bundle originally.

[hurttech]

I've tried that but I get nothing. The cluster is from an 90 i. I just swapped the speedo from my old one. Does it need any different coding plug?

[riverdale21]

Search for a thread by dashboardmonkey. Had the same problem and he helped me through it. There is a connector, forgot what it's called, that is in the dash near the ECU that leads to the tachometer and fuel economy guage. You need to run a new wire from the main engine harness in the engine bay to the connector in the dash.

Look up the wiring diagram for your chassis here http://www.armchair.mb.ca/~dave/BMW/, and the diagram from the donor engine. Connect the dots.

[riverdale21]

Here's the post with the info: http://www.r3vlimited.com/board/showthread.php?t=155220