Trick for checking the oil pressure... Get one of the cheaper tire gauges from the auto parts store (picture) and remote the stem. There's a 1/8" npt input! Put on a little plumber's tape. Find the sending unit ("sensor") on the motor. Take it out and put the tire gauge in. Voila, active/real pressure oil gauge to check the real pressure at the motor. (i.e. checks back to see if your sending unit is working)
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