Don't take this lightly. Treat it as a serious matter, diagnose it THEN determine from that if it's not so serious.
First off- verify the condition. As the others mentioned, the gauges and sensor can be faulty. Use a mechanical gauge to verify the pressures. You can connect the gauge to the sensor port. If you do, you might as well have a new sensor on hand to replace it while you're at it.
If the pressure is indeed low, and it onset rather abruptly, dive in to the common cause(s). Low quality oil breaks down and has wilder viscosity swings and a low quality filter can cause a drop in pressure. Or, if the filter clogged up and you're now bypassing it. The Supertech should be okay since it's synthetic, but you still have to start with the easy stuff first. Change the oil and filter with good stuff and observe.
If no change, do the O-ring test. Add two extra quarts to the crankcase and drive somewhere, preferably close and not requiring high RPM, you can put the front into a nosedive, like a shallow ditch or back it up a hill. If the pressure suddenly jumps up to its previously normal range, then you've diagnosed a leaky O-ring. Drain the extra two quarts and plan your repair.
Another possibility with this generation is a cracked head allowing the coolant to mix with the oil in amounts so small that it goes undetected. It sludges up the inside of the engine. Eventually, the pickup screen gets choked off, reducing oil pressure. Do you have to add coolant ever so often, like once a month?
