oil pressure high

[jondee86]

You may have more than one problem !!

If your aftermarket gauge is connected to the OEM sender, that will be
one problem. The OEM sender pulses when the engine is running, and
switches current to ground. The pulse rate varies with engine speed )oil
pressure). It is very unlikely your aftermarket gauge can read pulses.

The second problem is that the OEM sender should not be switched to
ground when the engine is not running. So if your gauge pegs as soon
as you turn on the key (engine not running), you either have a wiring
problem, or the sender is broken and shorting to ground.

Solution... get the correct sender for your aftermarket gauge, and check
the gauge wiring

Cheers... jondee86