VDO oil presure gauge pegged Options

[VaccaRabite]

New problem. (yay!)

For whatever reason, as soon as I turn the key, before the engine starts, the VDO oil pressure gauge pegs out well past 80psi (probably 120, but 80 is the higest number.)

The idiot light works as expected. Its green while the engine is cranking, but goes out about 1 second after the engine fires.

The sender is the standard VDO dual sender using a paintball hose remote hose, and a study mount to the case.

I have switched the leads at the sender to rule that out.
I cleaned the ground between the sender and the mount.
Not yet cleaned where the mount attaches to the engine case, but the connection there is solid and has lots of contact.

I forget how the sender works. Does it work by grounding itself?

Possible causes:
Bad sender.
Bad gauge.
wire pinched somewhere between the gauge and the sender?
wire pinched between fuse block and gauge?

Missing something?

Spend too much time trouble shooting this, and the car is still idling too high. No more time to work tonight. Sick. (IMG:style_emoticons/default/sad.gif)

Zach