[jclark003]

VDO has a lot of different sending units that are matched to the gauge. Some of them are backward in relation to the standard US 240-33 ohm (example 10-184).

I would first check the sender resistance at the helm(disconnected from the gauge) to make sure the wire isn't shorted to ground. Then I would ground the sender terminal and see which direction the gauge moves. If it travels to full then it is probably 240-33 and you have a sender or wiring issue. If it travels to empty your gauge is probably matched to a different resistance range. If this is the case it might be easier to replace the gauge since you already have a new sender.

Good luck