Location of oil sending unit on 88' V30? Keep blowing ECM B fuse

[Chevy3+3]

I have a new problem blowing the ECM B fuse and it controls the oil sending units and fuel pumps. I here a lot of people saying to check for broken or shorted wires going to the oil sending unit on the back of the block below the intake. I could be wrong but I don't see any sensor or sending unit back there. Running an 454 tbi

I do have what looks like an oil sending unit at the front of the engine below the power steering pump. The sending unit has a 2 wire connector plugged into it and a single wire connector also. I just want to know if anyone knows where the location of my sending unit is so I can start inspecting wires to track down the problem.

Thanks