The correct oil pressure sender for HJ, HX, HZ (& WB Commercial) is 360.005. It's resistance value is 73-10 ohms.

The 360.004 sender (10-180 ohms) suits HD to HQ Holdens, as well Commodore & WB Statesman.

This is where confusion sets in, the WB Commercial sender won't work in WB Statesmans & vice versa.

Dr Terry