I found the #13 pin. It does give me a tach feed, but the results of the RPM's are not what I expected. I am reading higher RPM's than I actually have.

I was told by the engineer of this unit that they used a wire off of the second from the left ECU harness plug, but he did not have the specific wire. They worked with HPS on this unit.

Do you have the pinouts or wiring diagram for the ECU?

Could there be a different feed for the tach?

At least I know the unit is working, it just is not reading the correct RPM right now. It was changing the voltage to the ECU as I set it to.


Thank you for your help.

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2001 CLK55, Intercooled Procharger, HRE's, Brembo's, bunch of other stuff...