Metered the oil sending unit. It read 15 Ohms to ground, w/engine stopped and 150 Ohms with engine running. Gauge metered 7.5 Volts to ground with key on & pressure switch unhooked. Reconnected, traced wire to left fender well, removed/reconnected three connectors at harness end, both units work as designed.
Maybe this will be useful to others.... Now - on to rusted battery tray.
