Although the gauge and the light agree, if there is no knocking, I think I would be inclined to unscrew either the light switch or the gauge sender and fit an adapter in there temporarily, just to put an old-fashioned mechanical oil pressure gauge on to it to make sure you really DO have an oil pressure problem first. It might save you a lot of work!Maybe I just have to start fiddling around to get the pan off. Removing sure seems possible in place but never know. Hopefully new shells work for me. Engine sounds just normal even with the light on, no knocking or rattling nor anything else, just the light after a while of running.