M800 Tacho connection

[knlmotorsport]

I am running M800 gold box in a 1999 WRX STI and cannot get the taco to work. How do I cannect the tacho wire from the M800 to the back of the dash? ie any resistors needed?

[RossB]

Pin B14 of the original ECU connector is the tacho signal. You will need a 2200 ohm pull-up resistor to 12 volts to make it work on an M800 output.

[knlmotorsport]

Thanks Ross.......Does this mean I put a wire to the tacho wire and off that I put the resistor to 12v?

[RossB]

Yes that's correct.