I have an ancient M444. The ONAN powered model. The oil pressure idiot light sending unit sprang a leak and just before that it would flicker on and off while the engine was running. I did put a mchanical guage on it and verified that the engine had oil pressure. About 20lbs at idle and 30lbs while running. There are no assets at bobcat warehouses. Given that it only operates the light could I replace it with an automotive one? Does anyone know what at what pressure it was designed to turn the light on? thanks Steve A.