A power steering pressure gauge is an instrument used to test the power steering pump pressure and check for defective power steering pumps and gears, and kinked or clogged lines. It can also indicate if a problem lies not in the power steering, but in the steering linkage or front suspension. Power steering pressure gauges usually come with a connecting hose and a variety of adapters. Note: because the power steering pump delivers very high pressure, it is essential that the procedure described in the vehicle manufacturer's service manual be followed.