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.

[BMXerror]

Okay, I was wondering about that. I figured that it worked the same as the dual sender because I thought both the terminals on the dual sender were the same, but I just went out and looked and there's a "G" and a "WK" terminal on the sender. I'm guessing "G" means gauge. There's no instruction on that on the box.
Also, I just went out and tested it like you said and it's result is opposite. With the wires switched, it's just flat no matter what I do. With them hooked up according to the instructions, it swings full, BUT if I ground the sensor wire to the engine it falls back to zero. I'm going to have to get that new sensor in, and then I'll see what it does. Thanks for the help.
Mark D.