I have bought off this site a set of motorbike throttle bodies for one of my Pinto engines
The manifold has a water temp sender 3/8 NPT where the 16mm heater pipe exits, I want to keep this so require a hard to find T or Y piece
It needs to be 3/8 NPT male to go into the manifold and a 3/8 NPT female to take the sensor then another takeoff for a 16mm hose tail the problem here is that the hose tails are metric or BSP
Any ideas where to look, I've tried CBS. Demon Tweeks and Merlin so far.

Try a hydraulic specialist. We have on up here with bins and bins of fittings so I assume you'll have someone similar close to you?

First hit of Google.

see HERE

3/8npt x 5/8" hose tail £2.65

Davie