Help me pick out a code scan tool. Here's what I think I want:
  • PC based - more function for less cost.
  • Monitor the current condition of sensor values.
  • Compatible with all (most?) OBD-II cars.
  • If possible, also compatible with my pre-OBD-II cars.
  • Cheap.
Here's what I've got:
  • 2002 Honda
  • 1996 Chevy truck
  • 1995 Ford E-350 Power Stroke Diesel
  • 1991 Miata
I've seen some ELM-based scanners that seem to be along the lines of what I'm looking for. Let me know what you like and what fits my needs.

Thanks,