Help with Oil pressure guage?

I just installed an autometer c2 electric oil pressure guage and was wondering what a 302's oil pressure usually is at idle. And Also when I shut the car off the needle on the guage goes to 100psi and when I turn the car on the cage goes back down to the oil pressure while the motor is on which reads abou 50psi? I was thinking that I had a wire hooked up backwards but I'm not sure, any help would be appreciated.
 
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the gauge should not be accurate with the key off, because the gauge is not getting power. just like a tach. depends on how you wired it up.

not enough oil psi? run a thicker oil ;)
 
The oil pressure reads about 50psi at idle and around 75 wot, but when I shut the car off instead of the needle going back to 0 it goes to 100, I just didn't know if it affected the numbers if the needle went to 100 when the key is off instead of back to 0. Would it matter if it went to 100psi instead of 0?