Hi Cosmic Bus, Since i was initially doing electrical stuff.. I did try a heat gun i use for shrink wrap.. The only other thing i could think of was heat the engine up a bit..?
Cheers fer all the help on here! Got me some (or rather chanced some.) 5mm vacuum hose that was thicker walled than the original, so got some slightly bigger clips too!
The hole seemed smaller than original but slid on neat when the engine was up to temp..
A dab of lithium grease on the nipple thing to the electronic turbo sensor to the gauge helped with the fitting from the T piece using the same hose... I didn't trust the clear stuff they sent with the gauge, but it did OK for a day to fill in till i got some proper!!