I recently bought a 85 300 TDT (california version.) When I bought it the oil pressure guage line was cut but it wasn't making any terrible noises so I assumed the pressure was ok. When I replaced it this week I noticed after the engine got to operating temp. (about 90F) the pressure would sometimes drop to "0" at idle and "1-2" at low rpms but go back up to 3 bar at higher rpms. Is there a pressure sensor on this version that might be bad?