Aftermarket Tachometer
 

I bought a Prosport Tachometer and was trying to throw it into my gauge pod.its god 4 wires: Red=12v constant, yellow/orange=illumination, black=ground,and green is what makes the actually tach work. I thought i had it figured out, im pretty good with wiring,i thoguht maybe try running the wire to the ecu rpm line....that failed, i tried the second rpm line and yet again failed. i tired both together and the car didnt like and would just crank lol. im going off my safc II wiring guide and it shows just the only 2 rpm lines, im going to see if i can find an ecu wiring diagram, but in the mean time, any advise or if anyone knows how to make it work it would be nice if you could share, little hard to race w/o the tach working. I'm riding in an 88 Turbo Supra w/Targa. Thanks!

Did you try connecting it to the factory tach wire? The schematic says its the IG- wire on the igniter. The same wire goes to one of the pins on the check connecter apparently which is marked IG- which is the same so you could run a wire from that to test the new tach before doing any cutting.

im out of a chematic, unless the wire is labeled IG on the wire.if you have a schematic you could pist or email me that would help ou t alot. ive ripped out my dash cluster b4 and i know what im looking at, kinda. i just dont know exactly what everything is and i dont want to snip anything i shouldnt

Link below is the schematic, the wire is a black one, meter it to be sure your on the right one and like I said, run a temporary wire from the check connecter (diagnostics block in engine bay by the fuse panel) pin IG- and see if it works.

http://www.cygnusx1.net/Supra/Librar...x?S=Main&P=040

thanks alot, ill check it out in the morning when i get home from work