Get a rod done.
Bad oil pressure sending unit?
Simple fix is usually a new oil pressure sending unit. It could be unplugged or the line broken somewhere. If none of these are the case, it's probably a bad gauge and will need to be replaced.
It is most likely the oil pressure sensor, located on the front of the engine block near the oil filter. There is also a slim possibility that the gauge in the instrument cluster is defective.
Reverse airflow feels a chamber inside the gauge and reads the pressure equal to the inside of the tyre its that simple. Same for air compressure, when the pressure is applied it seals the valve on the gauge end then back pressure fills the chamber inside the gauge when you release the gauge from the tyre valve the pressure has gone!!
More then likely you need to replace the Thermostat.
The sending unit may be faulty. The year, make, model and which gauge would help.
Pressure gauges work based on the principle that a fluid or gas exerts a force on the gauge's sensing element, which then deflects or moves in response to the pressure. This deflection is converted into a reading that indicates the pressure being measured. The gauge is calibrated to provide an accurate and precise measurement of the pressure exerted on the sensing element.
The fuel tank pressure sensor is for the EVAP system. It has nothing to do with the fuel gauge sending unit.
The problem could be a dirty sensor or the sender is no good.
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.
1984, Corvette the fuel gauge stays at 1/2 full all the time. Plaese help.
might be a bad fuel sender unit or BCM