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Not sure what years the superchips tuners cover but you may want to look for one that is VIN locked on ebay? Being VIN locked would only allow it to scan codes but it would be about the cheapest option
This is what lots of us use to read codes and do test on our trucks. LINK
EIDT: I just noticed you have an older truck that this will not work on.
It's not for my truck my engine doesn't have any computors and all I need to get codes from my trans is a test light. This is for A truck I'm going to look at for a friend.