Bought a 85 Z for $300 @ an auction. The engine is completely mickey moused. The wiring harness is good but for some reason my temp guage and speedo arent working. With an engine this crappy i need to know how hot it is until i can afford a new/rebuild. Thnx.

 

Temp gauge wiring is dark green, should come out of the harness next to the throttle linkage and go over the VC and exhaust manifold then down to the sender. The sender goes in the driver's side head between the #1 & #3 spark plugs.

 

craziness, the dark green wire is hooked the intake where the readiator hose comes in. i thought thats where its supposed to go thanks for the help, id still like to know why the speedo went to hell though

 

ok, got the temp. guage to work. now my question is what is the normal operating temp on my 305? I drove ti around the block and the guage said 240.

 

That's a bit high, 190-220 would be more normal.

If the engine didn't seem to be particularly hot, try a new sending unit.

The speedo problem is probably the cable.