#1 It will be accurate for 3 cylinders. Put it in the dump pipe like 99% of people do.
#2 You can eliminate the inlet manifold boost valve if you know your wastegate system is functioning correctly but 20 psi sounds high if you still have the original HT18 turbo.
#3 From memory, the front sensor (dark red/brownish) was to read temps for the EGR ECU so you can use that hole if you've removed the EGR.
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