i just replaced my si wire harness with the stock one but the wires for the dizzy were cut. i matched all the wires from the clip to the 99si dizzy and connected them and clipped it in. i have no tach but my speedo works. but i noticed there was an extra blue wire with no line throught it (plain blue)on the harness. and when i changed it to the other blue wire the tach would trip out and the motor would redline at like 4000RPMS, so i switched the wire back and still no tach.but runs good, also im using a p2n ECU. What ecu is that out of? thanks guys and girls