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Think Dave Dudes your man for the job, sorry m8 a bit far away to help
Not sure if yours are the same as Defi sensors but here goes
Oil Pressure
Remove original oil pressure switch from under the altenator, leaving adaptor in place, fit new sensor that came with guages, using PTFE tape.
Oil Pressure switch
Original oil light wont work & not sure if your new guages come with an alarm?
Oil Temp
Remove intercooler, there is a blanking bolt above cylinder 3 with an 8mm allen key fitting, remove the bung, you will need an adaptor, part# LMA067 from here use PTFE tape again & then screw in the adaptor that came with the guage,
Oil Temp blank
Boost Guage
used the T piece to connect to one of the vac pipes at the front of the inlet manifold on ours.
Not sure if this helps as this was for our classic & Defis, don't quite know what came with your guages, but good luck & sure Dave Dude will keep you right, let me know if there's anything I can help with.
Good luck
Paul