1993 600r problems

I just got a used 1993 600r with 19k on it.

I did an oil change, cleaned and lubed chain, adjusted distance to reduce chain slack according to haynes book and will do spark plugs and coolent flush soon.

However i have some small problems and balling on a budget does not allow me to do a complete overhaul.

1: Bike constanly has a low idle, i need to run the choke all the time or the bike will stall
2: Heat gauge does not seem to work or bike for some reason never gets hot (wish ful thinking)
3: No tank bolts, i dont have the bolts that connect the tank to the frame, any clue to where i find these or what size they are?
4: i need new tires, any good online shops to check out for 16" tires touring style"

I would appreaciate any and all help on those subjects.

:?