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All have working A/C, heat, cruise control, progressive powersteering, etc etc. just as the factory intended. No "rigging" or any sorts of voo-doo.
Crappy shops = crappy installs. You get what you pay for (or for home installs, lack of knowledge).
The Supra R154 will not fit the SC300, as the Soarer R154 has the shifter located on the back of the transmission to fit the longer car. Also the MKIII R154 has mechanical speedo, the Soarer has electronic.