The temperature guage on my 1990 F250 diesel truck is registering all the way to the left on Cold all the time, even after several hours/miles of driving. The exhaust temp gauge and boost gauge don't seem to work either (unless they only work when a trailer is hooked up).
I was going to replace the thermostat first. Is this the right place to start?
Recently got a new tranny also, is there a temperature sensor related to that that could be causing problem?
Thanks,
Wes