Gauge problem..., Oil pressure gauge skyrockets... Options

[BMXerror]

Okay, my new oil pressure gauge that I just wired up does something weird. When I turn ignition on it shoots all the way past the max reading (80 PSI). I can unplug the sensor wire from either the gauge or sensor side and the gauge stays pegged. If I unplug the ground on the gauge it drops to zero, and doesn't do anything when the engine's turned on (sensor plugged in). You would think it's hard to screw up such simple wiring, but I seem to have managed.
VDO gauge experts, the power lead comes from the fuse terminal to the + terminal on the gauge. The sensor wire is plugged into the 'S' terminal on the gauge. The ground is plugged in on the bottom terminal, which I'm assuming is the ground. That's what the diagram says, anyways. I'm using 16 gauge wire all around. (IMG:style_emoticons/default/WTF.gif) (IMG:style_emoticons/default/confused24.gif) Any help?
Mark D.

[Cap'n Krusty]

You want 1/8" NPT. That's what the case is, as well as the extension hose. You DO NOT want any thread that's not tapered. You use NO gasket or sealing ring. Ground the body of the sender, use 12V + for the "+" on the gauge, ground for the "-" on the gauge, and the wire from the "G" terminal on the sender for the "S" terminal on the gauge. "WK" is for the lamp.

The Cap'n