Thread: oil and coolant gauge reading low all of a sudden

Hi All I have a ht gts Monaro and all of a sudden the gauge that has the oil pressure and coolant temp both needles have dropped oil was 40 now 20 and coolant was 180F now 150F I have aftermarket gauges and they are still reading right any ideas?????

Checked the earths in dash & cluster....doesn't take much.

no good thinking maybe the little strap going from the gauges to the main body cheers

On a mates Monaro the gauges flickered whenever used brakes or even handbrake..found broken earths etc when it got rewired.

hi
The gauges are powered from a fused ignition source and go thru the variable resistance sender units on engine [oil andwater temp ] then electrical circuit returns to battery .

Correct voltage to dash board guage fuse then correct voltage at back of gauges . The earth side , wire from guage goes to senders ,check condition connections .

That's the basics

Then check earth straps and connectors at bulkhead if u have one
Battery to body
battery to engine block [bell housing bolt near starter motor]
battery to interior dash board