Oil pressure unit and gauge testing

[fireguyfire]

I've just fired up my 70 383 after adding a Holley Sniper and doing a bunch of work on the car; I'm reading zero for oil pressure on my gauge that I'm pretty sure was working fine last fall.
Obviously I don't want to run the engine and do my break in drive on the Sniper until I know I have good oil pressure, and it's just a sending unit or wire issue.

Is there a way to tell that I have good oil pressure in the engine without using the gauge?
Is there a simple way to determine if the issue is the single wire lead, oil pressure sending unit, or the gauge itself with the gauge cluster in the car?

[Skdmark]

Check this thread.
https://forum.e-bodies.org/electrical-and-audio/11/rallye-gauge-failure/12015/

[fireguyfire]

Turns out the wire was cooked and brittle and once I replaced that it's working fine.

[Skdmark]

[70 Top Banana]

 

[Dakota]

Glad you got it fixed.  That must've been really uncomfortable seeing the motor run with no indicated oil pressure. 

I am using the after-market analog oil pressure gauge that a prior owner installed, but upgraded from the copper tube that connected it to the engine to a braided stainless steel line that was suggested by member 1 Wild R/T.   I just trust this more.