HOTROD57:
I HAVE THE TPI GAUGES AND I COULD NOT SET THE SPEEDO EITHER . I TALKED TO THE TECH.AT TPI AND WHAT HE TOLD ME VERSES THE INSTRUCTIONS WAS TOTALLY DIFFERENT.I HAD HIM TALK ME THROUGH IT AS I WAS ACTUALLY DRIVING THE CAR. THE KEY WAS STOPPING THE CAR BEFORE ACTIVATING THE LAST BUTTON PUSH.

Don In Austin