Get a mechanical gauge just to eliminate the sensor/wiring 1 in a Million possibility. But do not drive it at all. There is a chance that the engine bearings are already shot due to Honda's wonderful design on their oil pressure sensors (not coming on until you have absolutely no oil pressure). So, if you install a new oil pump, check the pick up tube screen for bearing pieces, and also the bottom of the oil pan, and/or cut the oil filter open. If you don't see any bearing pieces, you may be able to just get a new pump and ride, but chances are, you are over 200k anyways and changing out the mains and rod bearings wouldn't be a bad idea either. Especially if you are going to be driving hard. And it may be cheaper to just get another block.