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  1. 11-07-2022 #3
    PlayingWithTBI
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    There's a VSSB on the back of the instrument cluster with jumpers to set gear ratio and tire size. Then it sends the signal to the ECM, CC, and Speedometer. Here's a write up.

    https://67-72chevytrucks.com/vboard/showthread.php?t=313815

    Edit: Some people solder in dip switches to make it easier for future mods.
    Last edited by PlayingWithTBI; 11-07-2022 at 07:42 PM.
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