Tank strainer may also be plugged/nasty. It will require draining the tank when you check it out.
The turbo will not cause it not to move up the incline you spoke of, although you may still have boost issues. Not a concern at this point.
Filters then strainer most likely. You certainly can't tell anything by looking at the primary filter. And look at that air filter too.
A constantly pegged temp guage would certainly mess with me.....

__________________
Jimmy L.
'05 Acura TL 6MT
2001 ML430 My Spare

Gone:
'95 E300 188K "Batmobile" Texas Unfriendly Black
'85 300TD 235K "The Wagon" Texas Friendly White
'80 240D 154K "China" Scar engine installed
'81 300TD 240K "Smash"
'80 240D 230K "The Squash"
'81 240D 293K"Scar" Rear ended harder than Elton John