Oil light on after water pump replacement

My 93 taurus’ water pump was making sound like its bearing was going so I took it in to have it replaced. Several bolts were broken in removing it so the mounting the water pump was in had to be replaced. Upon getting the car back it does 2 new things. The water temperature indicator now takes an hour to reach the warm area and the oil pressure indicator, the little kettle thing, comes on at idle and seems to be coming on at higher and higher RPMs. I can understand the thermostat getting damaged and the car taking forever to get warm but the oil pressure thing is odd. A new pressure indicator didn’t fix the problem.

Thanks

You need a “real” mechanic to look at this problem. Something is wrong that I can’t see from here (too many “could-be’s”).