Bench testing a gauge

[nboost]

I am going to install a factory stock oil pressure gauge in my Bronco. Is there anyway to test it on the bench before installing it in my dash?

 

[Steve83]

Measure resistance across its terminals; I can't remember the spec for those old thermal gauges, but OPEN CIRCUIT (infinite resistance, OL) or <10 would be FAILs. Apply 5-6V across them and it should complete a full sweep in >15sec.