An oil pressure gauge can fluctuate for many reasons, including an actual automotive problem as well as reasons like fluctuation in oil temperatures. In most cases, the gauge will fluctuate to indicate low oil pressure. ... More »

Checking the oil pressure of a car using mechanical gauges requires removing the oil pressure sending unit and attaching the gauges, according to Mark Gittelman for YouFixCars.com. Such gauges provide a more accurate rea... More »

A Chevrolet oil pressure sending unit is a type of car part that sends oil pressure information from the engine to a gauge or light on the vehicle's dashboard. When the oil pressure rises, the needle on the oil pressure ... More »

A mechanical temperature gauge uses a Bourdon tube filled with temperature-sensitive liquid to indicate temperature, while an electrical model uses a variable-resistance unit that varies current to the dial as temperatur... More »

The most common reason for a coolant temperature gauge not working is a problem with the coolant temperature sensor. Signs of a bad sensor include black smoke in the exhaust, a car using more gas than usual or a car over... More »

Fuel gauge problems are commonly the result of faulty electrical grounding at the tank or a problem with the sending unit inside the tank but can also be caused by faulty wiring or a bad fuse. Troubleshooting the problem... More »

To test a vehicle's fuel pressure regulators, connect the fuel pressure gauge to the fuel rail and start the engine with the vacuum line detached, and then attach the vacuum line and observe the drop in pressure on the g... More »