| Diagram | Fig. 34 — SPEEDOMETER AND TACHOMETER · ref 17 |
| Subsystem | electrical |
| Listed in parts books | 1974, 1976–1980 |
GEAR,DRIVEN-TACH GRBX
Driven gear for the tachometer drive inside the gearbox, part number 71-2653.
This is the driven gear for the tachometer drive, part number 71-2653, sitting inside the gearbox where the tach cable picks up its signal to spin the tach head. It's the gear that gets turned by the gearbox internals and in turn drives the tachometer cable up to the instrument. This number supersedes the earlier 70-5578, so if your parts book lists that number for the same location, this is the current part to order.
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The catalog shows this part appearing across a run of gearbox listings, all under the SPEEDOMETER AND TACHOMETER figure, which tells you it lives at the cable-drive end of the gearbox rather than up at the instrument itself.
If you're chasing an erratic or dead tach needle and the cable and head both check out, this driven gear and its mating parts in the gearbox are worth a look. Confirm which gearbox casing and drive setup you've got before ordering, since the catalog record doesn't spell out every variant it fits.
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