bubba24

Okay my sender reacts kinda slow, so I thought i would test it so what i did was I turned my iginiton to on, and the gauge will read 0, but remove the plug from the sender behind the intake, and the gauge reads max oil pressure, but if i go and take the plug and apply to a ground the gauge will read 0 again. Is this a case for a bad sender or gauge?

Thanks for any help