I have a 2000 Expedition with the 5.4 Triton V8. The oil sending unit was not functioning properly and would occasionally not give a reading causing the gauge to drop and light to come on when the vehicle has proper oil pressure. After putting thread tape around the new sensor and installing it until snug without over tightening, when starting the car it leaks like crazy, just pours oil out. After taking a look, it looks like the old one might have had RTV around it....perhaps the previous owner has replaced this part before. Is there any harm in throwing a bunch of RTV around the sensor, or does the entire oil filter housing need to be replaced?