Welcome to the Forum from NH.
Lots of knowledgeable folks here who freely share their knowledge, experiences, and perspectives. Knowledge is power.
I hope that you will become a participating member in the Forum's discussions.
Pics of the truck, please. If we can't see it, it does not exist.
You are already receiving sage advice from the knowledgeable folks on this Forum.
eBay has several Tech 2 scanners available, and you are looking at the $400-$550 price range. You just need to make sure that the software card is for GM vehicles. You do not need a CanBus adapter, as your year truck did not yet have the CanBus system implemented in it.