Not sure about the A/C ? I would normally leave re-gassing to a professional company. The Links below may be useful for any future reference. The last link you can download the workshop manuals and handbook.
http://www.supras.com/06/techcenter/display.php?QID=69
http://www.cygnusx1.net/supra/Library/TSRM/MK3/manual.aspx?S=IN&P=1
http://www.turboninjas.com/mk3supra