Go to Jaycar & purchase 3 resistors, they are very cheap, around $1 should cover all 3.
The ones you need are 75 ohms, 25 ohms & 10 ohms.
Substitue the resistors, one at a time in place of the sender & switch on the ignition. In other words disconnect the sensor & earth the wire thru the resistor.
I would fit the 25 ohm one first, let the gauge warm up (5 mins is plenty) & it should read half scale. Now try the other 2. The 10 ohm one should read full scale & the 75 ohm should make it read zero.
If the gauge does not read correctly, either gauge needs repair or recalibration or the volt reg (in the gauge case) is crook. Just take the gauge unit to a pro.
It's highly unlikely that you've bought 4 faulty senders.360.005 is the correct sender for HJ to WB commercial.
In my experience oil pressure at warm idle is usually in the red zone. As you raise the revs the gauge will move up, but it is slow.
Dr Terry
P.S. It's not a good idea to ground the sender wire directly to earth for any more than a second or 2, this can damage the gauge. This is why I use the resistor.
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