Off the top of my head, check these,
-doors are straight and not hanging when fully opened
-windows close properly with no gap where they meet the car body.
-most important thing is the condition of the motor/tranny.
(motors are known for burning lots of oil, tranny are known for grinding)
-water leak in the trunk area (poke around, you will smell mold if there is a
big water leak
-pull up the passenger side carpet, under it you will find the ECU. Even if the
check engine light is not on, if the car had a code recently this might tell
you (check here for all the details on what you have to do and what the
code/s might be
http://www.g2ic.com/tegtips/engine/13.html
These things should show you what kind of shape the car is in and if the seller is trying to sell you sh*t box. If you really want to get crazy, get a friend to follow behind you when you take the teg for a test drive. During the test drive take the car to red line in the first 3 gears (make sure to "power shift"). If the car burns a lot of oil, it will smoke when shifting. When you "power shift" from 1st to 2nd, if the wheels are not able to chirp, the motor may be dying, the clutch may be tired, or you may not know hot to drive

. These are all great things to check before buying any old teg, trust me. Good luck!!!
P.S. the second gen teg was from 1990 to 1993. The 1990 was 130hp.