oil pressure guage

Try
http://www.lcool.org/technical/80_series/80_series_technical.html

Scott,
Post No 4861 has some info on oil pressure gauges as applied to a Jackaroo. The values for an 80 series may be different, but the basics would be the same.
A workshop manual might give you the extra info you require.

Cheers,
Trev

Scott

Mine reads low as well. Very low in fact. I had the actual engine oil pressure measured with a master gauge and was told that at idle I had 27psi. oil pressure but the unit on the dash was just above zero. The book says that engine oil pressure should be 4psi at idle so mine was ok. Though you would never know looking at the gauge

Regards
Rusty

Scott.
If you want a cheap way of callibrating your gauge, make an adaptor from a bicycle pump hose to your gauge sender and then connect to your spare tyre, Eric.

Scott.
The air pressure in your spare tyre will operate the oil pressure sender in the same way as the oil does, so all you need is a nut with the same thread as the engine block soldered to the connector for the valve from a bike pump. Measure the pressure in the tyre with a good tyre gauge, then connect the oil pressure sender to the tyre and you should get the same reading. You will have to extend the wire to reach the tyre and you must earth the sender with a jumper lead or another wire. Is it permanent? I dont understand your question, the calibration should ok until something breaks or wears out. the most common cause of failure of pressure gauges is craking of the bronze diaphram, this usualy shows up as an oil leak. Eric