I'd like some advice where the problem is no reading on the gauge ( and can
use a Volt-ohm-meter if have to).

It is a three wire Electric gauge and a bell shaped sensor with the lead
attached at the top. Although upon sensor removal, there was oil pressure
(squirting G).

Could I check for meter needle deflection by striking the disconnected
sensor lead to ground or will that destroy the meter? Could I apply some
air pressure to the sensor and read a resistance change?

Thanks, Dick