Sounds like you have the wrong "bolt". The oil pressure sending unit is just above and to the left of the oil filter. It's a bitch to get to, but there should be one wire leading into it. You'll need to remove the whole sensor and get a 1/8" NPT "T" from a hardware store so that you can hook up both your sensor and feed line. Be careful not to crossthread the block, it's a pain in the ass from the angle you have to do it. Good luck.