How do you check fuel gauge on Cadillac deville?

The fuel gauge on a Cadillac DeVille, like most cars, is an analog or digital gauge located on the instrument cluster behind the steering wheel. There's no special trick to checking it; just:

1. Turn the ignition key to the "ON" position (without starting the engine). This will illuminate the instrument panel, including the fuel gauge.

2. Observe the fuel gauge needle or digital readout. The needle will point to a level on the gauge, or the digital display will show the percentage or number of gallons remaining in the tank.

That's it! If the gauge isn't working, you'll need to have it checked by a mechanic.