Ok I've read a load of the threads in here and anything pre OBDII seems quite vague or hit and miss.
The warning light thread a few steps down seems a good one for the flash codes.
However, so far a Peake Research tool isn't looking too bad at around £100 / £120 and seeing s there is very little, if any live data pre OBDII might well be the best choice.
However, I would be very interested to hear what others are using for pre OBDII cars for around £100 or less.
Ideally what you have, what it would do, how much and where it's available.
On some other makes an ALDL interface or similar can be made with a couple of resisters and transisters, interesting in anything like this too.