If the TSRM does not help you, then check out the bottom of this page that I will link:
http://www.ma70.com/bishop92t/techtips/index.html
By the way, this is not a general question but more years/generation specific...so to the MKIII section we go with this thread!
By the way, this is the link to the TSRM, in case you have not seen this thread:
http://toyota-supra.info/forums/showthread.php?t=2766