went to hook up my oil pressure gauge (electric) and every time a get power moving throught it the needle just quickly pegged over100 and stays there. anyone got any ideas? could it be my sending unit? it worked fine until i unhooked to move it to another location

 

try regrounding the wire to the actual battery if you havent so

 

Ground the sending unit

 

yea, you have the wires backwards or a problem with the grounds..

 

ok cool i'll try that again.i thought i had a good ground. i know i don't have it backwards cause when i wire it in backwards the needle pegs counter clock wise