Looking for some tips and advice from the guru's on here!

I have managed to acquire a set of second hand White faced Ford Racing gauges for my S2 track car.

As they were second hand, not all of them have fittings with them.

Boost, no issue as I can replace the existing like for like.

Voltage, no issue there but do people use the regulated 12v or the actual charging current (circa 13.8v).

Oil Pressure, no fittings, what do I need to buy and from who (sender, pipes, fittings, etc).

Water Temp, no fittings, what do I need to buy and from who (sender, pipes, fittings, etc).
Have you used a t-Piece into the top radiator hose, what inside diameter size?

I have searched all the permutations of gauges threads and find nothing conclusive as best practice.

cheers

Darren