okay i searched and cant find where the blue wire is located on the dizzy i know the green wire from the tach goes to the blue wire on the dizzy can any1 tell me which blue wires? my more is a b16 obd1 there have 1 blue wire and another one is it that one?

 

Just tap the blue wire from the back of your cluster or tap the RPM wire at the ECU.

No need to feed any wire through the firewall for a simple tach install.

 

take the cap of your distributer and you will see a blue wire, on mine there was a " - " mark on it for negative. Thats the one you want.

 

"tap the RPM wire at the ECU" what color is the wire?

 

Pin b15,,it's the white wire..And I think that's the wire that feeds the ignitor so it should be the most accurate..

 

you can find the blue tach wire on the big harness on the driver side connections in the engine bay.

 

i have a obd1 i p28 box