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hi
I have a 4jg2 wizard. the oil pressure gauge shot through the roof within 50m of home. saw the gauge at about 9kg/cm by the time I stoped and turned it off the gauge had maxed, with the engine off it dropped slowly, on start it came to about 8 and sits there. used to always be between 3 and 6.
anyone know what happened? did my sender just die?

It is possible the oil bypass is blocked but even then thats high. My money is on the sender

where do I find and how do I check the oil bypass
is it ok to drive with pressure at 8-9 as I need to get to work, or should I fix it first

Thats the million dollar question. If it is due to a blocked bypass or even filter then there is no oil getting to the rest of the engine. If it is that high and still getting round the engine it could blow the lines off the turbo and cause seals to leak. If its the sender no problem. If it was me I would temporarily fit an aftermarket guage where the sender is and see what it thinks. Senders normally fail to zero

so I changed oil and filter, helped a bit, now idles just below 6 but goes to 8-9 when I try to drive. still not game to go anywhere.
how do I check and/or clean or replace bypass valve?

what oil are you using?

15 40 Castrol gtx always used this

is the 22mm bolt next to the filter the bypass valve? can I take it out or will that ruin everything?

dont know
What happens if you turn the key on but dont start the engine? If the guage goes up the fault is electrical

GTX was a good oil but unless its the diesel version its not suitable for this engine. Diesel creates much more rubbish in the oil so you need an oil designed to cope with it