Long since discontinued since about 1996, someone must have one second hand, they were a quality unit and expensive.You could try a wanted add on enclosed links. The first link is probably your best bet. Alternatively get in touch with these guys
http://www.mmcompsys.com/motorsportshome.html on telephone Tel +44 8707 444666
http://212.53.73.128/cgi/forums/YaBB.cgi http://www.race-cars.com/forum/wwwboard.htm http://www.racecarsdirect.com/