but I don't have a bidirectional scan tool for OBD1 to check what the computer is registering
You don't need Bi-directional capability, hardly anything OBD1 used Bi-directional. You just need a scanner that can display live data or cable and Tuner pro.
89 K1500 Scottsdale 5.7L 5spd 3:42 RamJet cam Dart iron TBI heads 427 PCM swap
95 C2500 Cheyenne 6.5L turbo diesel 4L80e 4:10 DB2-4911 Manual pump conversion 0411 PCM trans control 2Bar COS
05 Outback XT 2.5L turbo gas auto
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