just a few wiring questions

[65truckowner]

I am almost done with my 66 frame off. I have a couple of problems I cants seem to figure out. One is my oil light stays on when the engine is running. The engine has 30 psi at a warm idle so I no it has enough pressure. It is a 350 engine. The wire that plugs into the sender is hot with the key on and when the engine is running but once plugged in it is not hot anymore... The other problem is my temp lights the green and red do not work at all. I have a new sender for them as well. Any ideas would really help.