Just supposing for a moment that "a friend" 
was stupid enough to nick a hole in the oil pressure guage capillary tube 
whilst snipping of a cable tie ...
Where would be the best place to source a replacement? What length is required (I haven't pulled to old one out to measure yet) and is it practial to buy the tube and end fittings separately which would make it a lot easier for me (I mean ... "a friend") to feed the new pipe through in place of the old one? I realise the ends have to be secure enought to withstand the pressure.
This is why I always recommend electric senders....
I believe that you can get plastic tubing any length and with the correct ends that also act as olives
I got the GL7 7 feet line with the OPG100 gauge from Think Automotive.
SV VVC 170 - 170.4 bhp @ 7100 rpm - 142.4 ft.lb. @ 4900 rpm
Why not leave it in there, and route the new one in through the dash at the back of the speedo/tacho gauges.
D
can you put a joiner in and keep the pipe you have?
Hmmm ... don't know what route you guys are using but I just managed to get it off and measure it, and it's plenty long enough at exactly 6' - and that's on an SV! Mine was routed from the gauge down through the big grommet in front of the gear lever then forward into the engine bay and along the engine wiring loom, following the tail of the loom round past the dipstick and across the loom shoe at the front of the engine straight to the oil filter housing.
@SM25T - The pipe on mine has identical female fittings at both ends like this:
At the engine end, there is an adapter with two male threads of differing sizes, what looks like something like M12 fine with a copper washer on the engine side and what I guess is 1/8 BSP cone to mate to the pipe. Your earlier reply seemed to say it was a male fitting at the engine end - is mine unusual then?
Will be a bit tighter to squeeze through the big grommet but I guess other people manage
A quick google search finds this from Demon Tweeks - and probably cheaper elsewhere with a bit more looking. I'll double-check the engine end fitting before ordering one - although it looks identical from outside I've left it done up a the moment to avoid an oil leak.
Thanks as always for all the helpful input.
SV VVC 170 - 170.4 bhp @ 7100 rpm - 142.4 ft.lb. @ 4900 rpm