1995 GM vehicles generally were using ALDL as its OBD1. There are a few in the 95 family (Camaros I think) that were early version of the OBDII connector, yet still spoke ALDL. Typically you can use a paperclip to pull the codes on those vehicles, but if you wanted more specialized data things usually you needed a snapon brick with the appropriate cartridges or some form of the Auto-Xray (For my 91 chevy, I had an Auto-Xray 240; Old I know, but with the right cable/code it could do Dodge, GM, or Ford)
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