If you got a little electronics skills and some parts, you can make a scanner cable that could plug to a serial port on a computer and get the data. I made a cable that works on my 93 2.8L s10 and my 87 buick lesabre. See this web site :
http://w1.601.telia.com/~u60113744/s...dl/winaldl.htm
Heres a screen shot of it when I was driving:
