If you have a tacho pin out of the ECU then you will need a converter to make the stock tacho work. Stock tacho needs a voltage spike signal from a coil, the ECU gives a 5V square wave.
If the ECU doesn't have a pinout you can tap into the wires running the coils and make your tacho work.
I have circuit diagrams for both circuits at home and I can email them to you or post them here in a couple of days if you like.
Wed, 15 June 2005 05:23
