If a guy was in the market for usable TR4 temp gauge and an upper adjustable steering column, where would he start looking? Other people find things on ebay, but I just don't seem to have much luck there.
Ebay can be frustrating; takes a lot of looking and even then many sellers don't correctly advertise what they have. Your best bet is to set up several searches and then check them frequently. Don't forget the UK version of eBay; although many sellers there don't tell eBay that they will ship overseas, I've had good luck in asking if they will. A gauge would be small enough to go by Royal Mail "small packet", which is reasonably priced and not too much hassle.
There are also several people in the US that break TRs when they get them, so it's worth calling around. TSi, Triumph Rescue, Triumphs Only are a few examples. Around here, I would also try "The Shop" (aka John Nichols) and Albert Roth. There's also a fellow near Indy that breaks TRs, but I'm afraid I don't recall his name offhand. Ask Ted at TSi, I'm pretty sure he'll know who I am thinking of.
Or just joining your local club and asking around at meetings will sometimes turn up what you need.
I got my TR4 temp gauge from a TR owner on the east coast, who is sadly no longer with us. Unfortunately I was too upset by the news of his passing to even ask what happened to his toys and powder coated parts collection.