1992 air conditioning has a R12 "deep" seated high side port and a regular A/C gauges test set won't work.
Found the following port adapters below.
Gary
....
per Marc Hailbeck the ZR-1 Specialist uses:
Found the following port adapters below.
Gary
....

- Santech R12 high pressure port adapter for GM Deep Access 1991 & later part no.: MT0436
- Mastercool part no.: 90338
per Marc Hailbeck the ZR-1 Specialist uses:
- Use R134a refrigerant service port adaptor AC Delco part # 15-30419 or GM part # 52467941
- Use with R134a gauge set
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