Here is the front page. Its for 1990, but you gotta figure its gonna be very close to accurate for all the MKIIIs. Only a few changes thru the model, and of course the turbo-vs-n/a.
http://www.cygnusx1.net/supra/library/TSRM/
Also look at this site....
http://www.supras.com/06/techcenter/techtips.php