What needs to be done to change out the oil pressure sending unit. Mine is leaking bad.

 

Unplug the wire, un screw the unit, there is a hexnut between the motor and the large round part ,look near the motor end of the part, use 17mm openend or is it 19 mm ,you will see .Put sealer tape on the new parts threads ( do not cover the hole) put in part snug it up (pipe threads) replace clean wire. Takes3 minutes