I own a 2002 Bonneville SSEI Supercharged
when its not running it says 0
but when running even warm it says 120 was wondering if this was normall
seemed high to me
wasnt shure if it was because of the supercharger
thanks

it sounds like your sending unit is going bad, its very common on these cars

Agreed, replace the sending unit and check it out from there.

Possibility it could be more than just that, but unlikely.

Oil Pressure Sensors when failing usually indicate maximum psi (end scale) on the oil pressure gage.

$30-$40 part that you will want to replace when you do an oil change

We've seen a lot of this. 99% chance it'* a oil pressure sender.