Hello I have a 1968 mustang 289 and have had issues with the gauges not working. My temp gauge starts at cold and climbs to hot as I’m driving or idling seems like in 3 minutes the car marks hot but eventually after another 3 minutes or so it will fall back down to cold and will remain there until I restart the car. The oil pressure gauge seems to just shoot straight to high and same thing eventually falls down to low. My gas temperature isn’t reading at all and the sending unit is new. I...

Gauges marking incorrect?