100S questions

[Rokas Reipa]

Hello everyone,

I am now a proud owner of a 1993 100S 5sp. Been looking for a car to replace
my dead 5kcst and found this one owner gem. It appears to be in great shape,
every single feature works and it drives superbly. I do have a couple
questions however:
1) There is a mechanical grinding/moaning noise in first gear, starting from
about 2500rpm and continuing on. It appears when the car is warm or cold and
does not appear in any other gears at any rpm. What could this be?
2) Under what circumstances should the twin electric radiator fans come on?
I know this car doesn't have after-run cooling like my old 5kcst did. I did
turn the a/c on briefly and they did switch on but I haven't seen them in
operation otherwise. The coolant temp gauge is in the lower third during hwy
travel and halfway up during prolonged idling.
3) The oil temperature gauge appears to not function because it never gets
past 60C. I suppose the sensor is dead? Where do I get a new one?
4) The oil pressure gauge reads 2bar when idling and maxes out when driving.
Is this normal?
5) Gonna have to replace the gamma radio(non bose) as it is intermittent.
Any problems hooking up a standard panasonic cd head unit in terms of
antenna connectors and speakers? I know there are two antenna connectors,
I'll just pick one i guess.

Ok I think that's it for now. Thank you in advance and sorry for so many
questions. It's a fantastic car, I like it a lot more than my old typ44.
Regards,

Rokas Reipa
University of Maryland, College Park
1993 Audi 100S 5sp