If you only want to check the oil pressure switch use a bulb and it should go out when the pressure comes up.
As for the earth being live it would melt the wiring if that was so.
If you are using a test light with two wires ie red and black it will light up on earth.
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Cost : Little as possible.
Thanks : To those who by their generosity my build has progressed.
Its a handmade sports car not a flaming kit car !!!
If at first you dont succeed,avoid skydiving...
No parachute require to freefall,only if you want to do it twice.
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