If you want the most dependable, simple and accurate approach and if you're able to do instrument conversions (which isn't all that difficult, really), you might consider adapting one of the GPS speedometer units to your speedometer. In the "interiors" section you can see how I've done this for a 1952 pickup. You won't get an analog odometer, but there are digital workarounds...as you can see I've done. Good luck!


~ Jon
1952 1/2 ton with 1959 235 | T5 with 3.07 rear end