Is there an easy way to verify what my oil pressure gauge is reading? I installed a remote oil pressure sensor, wired up to a light on my dash. The remote sensor is *supposed* to be calibrated at 20psi. However, according to my stock, dash gauge, the extra light I installed comes on once the pressure drops to about 30-32 psi. I'd like to figure out which is correct - the stock, dash gauge or the new, remote sensor.

This picture shows the oil pressure sensor (blue shrink wrap):