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Jones 3 inch Mechanical Tachometer with Telltale
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These are considered by many racers to be the world's finest mechanical tachometers. We only stock the highest quality sealed unit with a tell-tale needle.
The 3" nominal size mounts in a 3 3/8 inch hole in the dash panel. This size has a polished steel bezel for a classic look. The standard configuration has the tell-tale reset button on the side, and the cable input fitting on the back. A nice feature on these tachs is that the input is non-directional, which eliminates the need for a reversing gearbox. Just make sure to order the correct drive ratio.
The 4:1 ratio is used when the cable is driven from the camshaft by a Smith's right angle gearbox, which drives the cable at 1/2 camshaft speed (1/4 crankshaft speed). This is the correct ratio for most FF1600 and FF2000/S2000 installations.
The 2:1 ratio is used when driving directly from the camshaft or distributor without a speed reduction gearbox. It is also used when a 2:1 reduction gearbox is driven by the crankshaft.