There were a couple of things I noticed when I first bought the gt. The coolant overflow cap had some kind of quick weld on it (where the original cap was broken and then sorta rigged back on). As well as a slow oil leak off the head gasket cover (and 2 of the 8 screws missing). There were a bunch of other things as well but these were the two main points of concern.
I saw this really bad ass looking universal overflow tank so I thought, "hey why don't I fix the cap issue by replacing the whole thing?", sense I couldn't seem to find just a replacement cap for the OEM tank.
Okay! So here you can see were the coolant overflow tank should be. It bolts on with 2 x 12 mm bolts, and sits just to the right of the fuse box on the passenger side of the vehicle.
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In the 1995 Mitsubishi 3000gt the censor for you coolant system is built into the bottom of the Coolant overflow tank, and has one wire that plugs in near the fuse box. Mitsubishi does not sell the censor without the tank assembly. I wasn't aware of this until I'd already removed the OEM tank and had the Universal tank ready to install. Now at this point I should have realized my hair brain scheme was not going to work and just ordered the OEM tank. No! Being the stubborn person I am and wanting a cool looking metal tube instead of the factory plastic bottle I continued this fiasco. I removed the censor from the old coolant tank, and using water proof sealant, fit it into the the new tank. Using two strips of metal I bolted the universal tank in place and attached the radiator hose back to, well, the radiator of course. This tank did hold water and worked for a little while, but it was not giving an accurate temperature reading to the dash gauge. I've since installed an OEM coolant tank with a brand new censor and the car has stopped overheating.