The problem Im having is that the dash temperature gauge is not moving. This happened fom one day to another, & Im affraid that if it is the temp sending unit the engine will overheat.
I got headders & changed a while ago to the jet temp sending unit.
has anyone heard of this before?

 

I didn't know Jet made a temp sender. I know they make a fan switch. You sure you put the right piece in the right place connected to the right wire?

Temp sender is generally in the driver side head between cyls 1 and 3. Fan switch is generally in the pax side head between cyls 6 and 8.

 

Its not your jet fan switch. Do as kevinc said, and check to sending unit which is on your driver side head. Either the wire fell off, or its bad.

 

I see, is not the same thing. so the fans should be working regardles of no reading, right?

I will check today.

 

Yup, the dash gauge is completely isolated from the ECM and the fan switch.

 

Yup, the cable was hanging loose. Ive must have disconeted it without notice while changing the wires. thanks for the help.