Oil Pressure Sender Ground
Yes, and hello to you kind sir's. . .
Hold the bottom of the sending unit towards you so the plug part looks like an oddly shaped or fat "T", the prong on your left is the hot lead that you want to run to the gauges. The prong on your right is dead and has no use . . .
You don't have to ground the right prong on the oil pressure sender. It is an unnecessary step. If you look on the Z32 harness, there is only one wire leading the the sending units plug. The other slot on the plug is blank (just plastic). Therefore there is no need to ground it.
Also, there are three T4 bulbs that illuminate the triple gauge cluster for whoever was asking.
Respect
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