check ground on fuel tank
A faulty fuel gauge sending unit in the fuel tank could cause that.
A low coolant level could cause the temp gauge not to read correctly. A faulty temp gauge sending unit could also be the cause. The coolant leak, you would have to find the source of the leak to determine the cause.
The temp sending unit may be unplugged or faulty.
It is important to know when car parts quit working, and why. A faulty voltage regulator, blown fuse, or the wiring to the battery can cause this problem.?æ
could have faulty or dirty contacts, pump motor could be bad or the pressure gauge is faulty
It could be a faulty gauge, a faulty sensor, or a wiring problem. What engine do you have in what year car?
There are a few possibilities: A bad sending unit (inside the tank), a broken wire or other faulty connection, a faulty gauge, a bad fuse...
A faulty thermostat might cause the temp gauge on the 2000 Nissan Altima to raise to hot when the car is not overheating. A faulty thermostat can cause the gauge to move up and down and might even turn the fan on.
Could be a number of reasons. The reading could even be the result of a faulty gauge set. You need to have a system performance test done to pinpoint the cause.
Faulty sender unit maybe? Or a bad earth.
Normally it causes a lower reading then higher
-faulty oil pres. sending unit -faulty oil pump