Seems to be quite a lot of confussion around how possible this job is with out removing large amounts of engine ancillaries. I managed to do it with relative ease once I'd acquired the correct tooling.
This is a guide on how to remove the stock sender and replace with a different one, if you wish to retain the stock sender (not necessary as it's set too low to be of any use) then you'll need a T piece.
Tools required
1/4 drive ratchet with 14mm socket
14mm spanner
1/2 drive ratchet,
1/2 drive 4-6" extention
1/2 27mm deep socket (£5 off ebay)
First remove the A shaped bracket that joins the inlet plenum to the bottom of the bock, the top two bolts are easy to access from the top, the bottom is not too difficult when using the 1/4 drive ratchet.
Once removed unclip the connector from the oil pressure switch from the top of the engine bay, the clip for the connector is on the rear most side of the connector. The switch is located to the left of the oil filter
Below is a picture the the standard pressure switch with the connector removed viewed from underneath the car.
Place the deep 27mm socket over this and then undo from the top of the engine bay with the ratchet and extension and finish off by hand
Then simply insert your new sender (loads of room around this hole so even large autometer style senders should fit) however the thread is 1/8BSTP which is perfect for Defi senders but not some other brands so a simple adaptor (a few £ off ebay) maybe required.
It really isn't that hard to do yet is made out to be near impossible without lots of intrusive work first. The deep 27mm socket is the key in this operation and it really is near impossible without it.
Hope this helps people
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