| Also known as | D578 |
| Diagram | Fig. 34 — SPEEDOMETER AND TACHOMETER · ref 9 |
| Subsystem | electrical |
| Listed in parts books | 1966–1974, 1979–1980, 1983, 1985 |
| Also fits (as replacement) | 1974 · for 60-3933 |
Tachometer cable (28 in. long)
Triumph tachometer drive cable, 28 inches long, listed in the parts books as 60-0578 (formerly D578).
This is the tachometer cable, 28 inches long, that carries the drive from the gearbox or timing chest takeoff up to the tach head on the instrument panel. It's a Triumph part, and it shows up in the parts books under the SPEEDOMETER AND TACHOMETER figure across a long catalog run from 1966 into the mid-1980s. If your parts book lists it as D578, that's the same cable — just the older lettered form of the current 60-0578 number.
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This cable also carries a factory supersession from 60-3933, so if you're working from an older parts list and see that number, you're looking at the same physical piece.
A cable like this wears out from the inside — fraying strands or a dry, stiff outer casing will show up as a jumpy or dead tach needle before the cable snaps outright. Worth checking the routing for tight bends or kinks when you pull the old one, since that's usually what kills these over time.
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