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the guage doesn't move until it is started

doing an image search of 4jg2 filter housing shows unit has 2 bolt heads one is 22mm the other 24mm (checked by fitting socket to them) either one of them is the valve I think
hopeing it could be as simple as removing and cleaning
not sure if I should do this or not

and yes its the gtx diesel

that didn't solve the problem.
must be a blockage or restriction after the gallery in oil circuit
will try engine flush
I really don't want to have to pull engine apart
I hope no one else ever has this problem

can you get another guage sender?
even a cheap mechanical guage from the auto parts store will prove the current guage

ok will try that too
I was ruling that out coz of the 'senders normally fail to zero' comment and what a sender does, seems it could only fail to zero.
I also don't think its a faulty gauge as the engine told me there was a problem (a kind of shuttering didn't want to run)
it idles fine and revs in park but with higher than normal pressure
just when it is in gear and moves it goes haywire

Check the earth strap on the engine

that's it problem solved

thanks a million geeves your a legend

don't know why or how but I just gave the earth wire terminal connector bit a shine up and everything back to normal
glad I didn't do a flush as I read it can create more probs
thanks again

Its one of those rare faults that never makes sense.
The clue was it being worse moving. You would think that that earth would stop the engine starting but there are several places it can get an indirect earth. I read a report years ago about failing auto transmissions where the insides were showing evidence of electrolysis. They couldnt be saved. The cause bad earth strap on the engine. Wizards are all auto from factory