Oil pressure gauge not working in Duster rally gauges

Putting everything back together after having the bezel restored. Got just about everything working, new LED's bulbs, sockets, all gauges seem to be working except the oil pressure gauge.
At first it was pegged to the high side, along with the gas gauge, but once the whole thing was grounded the gas gauge is OK but now the oil pressure gauge does not move. I have a mechanical oil pressure gauge also that is on a fitting with the oil sending unit, I have good pressure. Could the problem be in the round plug with the connectors that plugs into the back of the dash? Does one of the wires make the oil pressure gauge work?IMG_5284.JPG

IMG_5283.JPG