I've got a VDO oil preasure gauge with the standard big fat sender.
On the sender terminals; one is marked G the other WT.
I'm sure that the one marked G goes to the G terminal on my gauge.
The question is what goes to this second terminal marked WT?
It originally had a white wire to it.

Quick tip! If you need to hook up both your idiot light and a regular
electronic sender you can get them out of the way of your distributor by
putting your T fitting on the end of a flexible grease gun hose. The hose
is rated at 3000PSI and already has 1/8" NTP fittings on both ends it
also have small 3/32 holes in the fittings that help keep gauge bounce
under control.

Stan Wilder
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