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



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?


1st. Verify the sender is working by removing the single wire and
attaching your
ohm meter from the output to a known good ground. If the sensor is
good, you will
get a varying number as pressure changes.

2nd. Check for voltage coming from the gauge lead with a/c power on.

3rd. Check for voltage to the gauge and the light, also checking the
the case does
have a good ground.

If all check out ok, hang a mechanical gauge to verify that you do
have pressure.