[99LS1]

The coolant temp. guage never worked in the 73 mach, so I decided to update it with new guages (along with the oil pressure/volt. guage) while troubleshooting the problem

With a new sending unit the guage doesn't read, it just bounces below 100; even with the car warm. To test the wiring I ran a new line directly to the sending unit, didn't fix it.

The oil pressure guage is now acting the same way. It bounces around way too much to work right. Before the guage swap it too was working.

The alternator guage is working right and has always worked.


Any thoughts? I only have a schematic out of a haynes manual and I'm having problems understanding it. Wiring is not something I understand very well.