Truck runs great but the oil pressure gage goes zeros out

I was told the sending unit is at the back of the block.It is very difficult to get at. My truck is doing the same thing and I was told I should try to clean the connectors to the sending unit and the unit its self and if that don,t work to replace it. I was told the sending unit is at the back of the block.It is very difficult to get at. My truck is doing the same thing and I was told I should try to clean the connectors to the sending unit and the unit its self and if that don,t work to replace it.

It is on the left side at the back of the block .You will need a 1 1/16 sending unit socket,it is a deep socket.I also bought a mirror small enough to see back there. The unit was 53.00 and the socket was 13.00. It took about 20 mins ,but solver the problem. Pressure is steady.

It is on the left side at the back of the block .You will need a 1 1/16 sending unit socket,it is a deep socket.I also bought a mirror small enough to see back there. The unit was 53.00 and the socket was 13.00. It took about 20 mins ,but solver the problem. Pressure is steady.