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on the Opti, you cannot bypass any of the sensors, the engine looks to these to get the engine to run correctly. With a beeping alarm, it is one of the sensors that is out of range. You have eliminated the fuel and the oil, but it still can be any of the others. When the engine alarm goes solid tone, that is either overheat, high battery voltage, or loss of the oil pump electrically. I would start with the battery voltage when the engine is off, then with it at idle, and a last test of it when the engine is on plane. if it ever reaches more than 14.2V DC, the regulator in the Alt is bad.
The oil pump just draws from the oil tank on the engine. The ECU can only tell if it fails electrically. If you wanted to disable the oil tank, just unplug it.
Locate the oil pump of the right side of the engine at the front. Run your hand under the pump, is there any oil there?