(20-08-2013, 02:48 PM)C.A.R. Wrote: But if I unscrew it from the inlet pipe won't that whistle like a bitch? It already makes a fair bit of noise now that the gauge hose has come off!
Yeah, i wouldn't drive it with it removed, you could remove it measure the thread and then put it back until you get the new one, while it is off you could fill the little hole in the brass nipple with some repair putty or chemical metal type stuff to block the hole off, just until the new one arrives.
If you are not sure how they fitted it, be careful when removing it as you don't want to damage the inlet elbow.