im after a oil sandwich plate but dont know what size to get.

M18
M20
or 3/4 UNF

Sandwich plate

What's that for, not to go in the Coupe?

its so a external aftermarket oil pressure gauge

You know there is another place to take a feed from without the need of an additional plate? Above the feed that comes out for the turbo is another take off point, just need to undo that and you have another feed

???? what size bore is it, and would a oil pressure sender screw straight in?

Dunno and dunno. I moved the sensors about so i could use the top feed for one of my gauges. I did need an adaptor which i got from Pirtec for about £4

Why don't you use the take-off for the original pressure gauge?

because fiat gauges and sensors are well crap and un-reliable, I want to use a stepper motor gauge with a high precision sensor

No, I meant why not unscrew the pressure sensor and put the new one in the same hole?

good point but i woould like to see the compareson between the oe gauge and a aftermarket.

does anyone know the thread size for the oe sensor

Not to hand no, why not take one out and take it to a local hydralics place and get them to tell you the thread size?

i have found the relavent size for myself for a sandwich place or anyone wanting the measurements for aftermarket gauges or a after market larger oil cooler

# Description : Oil Filter
# OD/Length: : N/A
# Thread Width (Long Side): : UNF 3/4
# Width (Short Side): :
# Height: : 77

may i add this is for the 16VT