Does not work by itself! Needs the ALDU1 or APU1 to work.Works with pre-1995 GM ALDL ports. You need this to log data on your GM. Connects directly to AutoProm or ALDU1. Is used on most pre-1996 GM EFI cars. Does NOT work by itself! Requires the ALDU1 or APU1 to actually interface to the PC!
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