[Trigger]

After tracking down the oil leak from the Chain tensioner cover that coated the drivers side of the engine. Big thanks to Uncle_Ken for that write up.

I still had an oil leak that was dripping off the pan. Thanks to the search found it was the oil pressure switch (Thank you all for sharing your frustration with getting to it.)

Quick trip to pick up one that fits (multiple options available) got the Fuelmiser Oil Pressure Switch SKU: A9240554 $21 which I checked before I let the shop needs 24mm deep socket, all good got one of those. Also picked up 27mm socket as checked the workshop manual and it says 1 1/16'' (26.97mm) for the switch so think all good.

Tried from underneath with it up on stands could reach it but not with a socket so went in from the top. removed the snorkle and airbox, Ok could get in there but a bit tight access (yes I got my arm caught and had to wriggle around to get back out, wife laughing all the way).
removed the thermo fans and no problem getting access now reaching in under the manifold.

Of course 27mm socket really loose fit arrg. Back to the shop for 25 and 26mm just in case. 25mm no go, 26mm still slightly loose but Ok.
Note minimal room under the manifold what with the aircon compressor in the way and even with an extension bar still no go. Had to use stubby socket wrench to remove the old one and install the new one fortunately I had one or back to the shop again. Start engine and no more oil leaking down the side of the block. Put everything back and all good.

All up two days, actual time pulling things out replacing switch and putting everything back under 15 minutes.

Having notes from people who have already done it to guide you priceless.