This is a pic of the oil pressure sensor after I got it plugged in. It was in fact unplugged and the only way I found to access it was through the wheel well with the tire removed. The warning light went away and the gauge now functions normally, albeit being on the high side. The late model oil pump and relief system operates at a higher pressure as predicted. Three choices from here; change the sensor to late model, change the relief spring or just live with it as long as the indicator on the dash stays in a readable range.