Put the specifics of your vehicle in your profile signature or include it in your posts so people don't have to dig to find out what you're running.
NO, the 7M-GTE uses a VERY different type of meter. The meter used on the non-turbo 7M-GE is similar but larger. The meter from a turbo MKII MR-2 or RX-7 (FC) or 22R-e Could be used but a fuel controller would have to be added and tuned to make up for the differences as the entire fuel scale would be off. Regardless, it's not relevant to your situation.
You need either a complete AFM for a 7M-GTE, just the black electronic component which bolts in to it, or the electronic component from a Lex 1UZ (DO NOT USE THE HOUSING!!).
Many of your questions are answered here and there are links to online copies of Toyota's service and repair manuals:
http://www.toyota-supra.info/forums/mkiii-faq/