Oil Pressure Gage and Sending Unit Revisited
Test results graphed.
Even ignoring the readings outside the center of the range, it seems way off of spec.
For reference AMC '85 FSM allowed plus minus 4 ohms at 0 psi, and 0.5 ohms at 80 psi. Assume Chrysler's allowance was similar.
Bad unit? Wrong sender calibration for this application?
This might be useful too. A common replacement according to the cross reference charts is Standard Motor Products PS-59.
As luck would have it there was a snip from the catalog on the web showing ohm range of the sender at two pressures.
Blue Dashed lines connecting the 8 psi to the 90 psi spec. show where the in-between resistances might be.
Test results graphed.
Even ignoring the readings outside the center of the range, it seems way off of spec.
For reference AMC '85 FSM allowed plus minus 4 ohms at 0 psi, and 0.5 ohms at 80 psi. Assume Chrysler's allowance was similar.
Bad unit? Wrong sender calibration for this application?
This might be useful too. A common replacement according to the cross reference charts is Standard Motor Products PS-59.
As luck would have it there was a snip from the catalog on the web showing ohm range of the sender at two pressures.
Blue Dashed lines connecting the 8 psi to the 90 psi spec. show where the in-between resistances might be.