Rebuilt my bottom end everything new had it running in the car and it started knocking so took it out again replaced all bearing shells greased them up with graphogen grease changed the oil pump again incase it was that to be sure. So i got it running again today and it was all going well sounded nice and quiet then the dreaded light came on but it isnt knocking, ive changed the oil pressure switch to see if it was that and no luck there, any ideas? Really peeing me off now as its costing me time and money