First, make sure it's actually a gauge problem. A lot of times it's not on Fieros.
If the gauge is "pegged" then it's not the gauge, but the oil pressure sensor. This sensor is located between the batter and the vacuum tubes running alongside the motor. You'll see a rubber connector attached to it coming in from the top. Unplug it, and you'll see the sensor - likely covered in oil.
If the gauge is indeed inoperational, then it's simply removing both the auxiliary gauge beauty cover and the radio surround beauty cover. You then have to unbolt the auxiliary gauges from the console skeleton. Once the whole assembly is removed, look underneath the gauges and you'll see four bolts. Remove these, and they'll separate from the trim piece, allowing you to remove the gauges.
my uncles 84 fiero only opens with keys. My Fiero has a button on the top right of the gauge cluster that will open the trunk. It has to have a battery or the engine running to do so though.
Check with manual gauge - if pressure normal - could be defevtive oil pressure sensor or gauge
Go to a Pontiac Mechanic and spend a few bucks.
Remove the fuel tank Remove the gauge sender and pump assembly Change pump and pickup sock Reassemble I have to do mine again this weekend. Its only got about 60,000 miles on it.
Take the gauge face plate off, pull the gauge out.
There is no relay for the fuel gauge. It is powered directly off the ignition switch. The fuel pump relay is behind the driver in the engine compartment on the fire wall just forward of the air cleaner.
change in temperature causes change in pressure
Pressure Indicator is any instrument that indicates pressure. Pressure Gauge is also a type of pressure Indicator. It is a mechanical device. Pressure indicators can work on mechanical deflection (in case of pressure gauge) or Piezo electric effect, change in capacitance, change in inductance etc. These are generally digital type instruments.
That's gauge pressure.
Most oil pressure gauges operate by a varying voltage. The oil pressure changes the resistance in the oil sensor, causing the gauge to change readings.
A pressure gauge indicates actual pressure and a differential pressure gauge indicates the difference in pressure.
Because Pressure gauge measures the the differenceof pressure so it is called pressure gauge not meter.