You may not be interested but we have gone to gps speedometers on nearly all the rods we build and some of the restorations. No cables, gears, or ratios to worry about and you can switch to any tires or or rear gear and they stay dead accurate. They are starting to make some that fit the factory instrument cluster on popular models. There are virtually no "dead spots" for gps units anymore. Just a potential option to consider.

Evan