Small Disc (with 710 stamped on it) screwed to right hand side timing case

[TRIGWELL]

Can someone please tell me what the small disc screwed to an A65 Lightning timing side case is? - this disc has '710' stamped on it.
Please see attached picture.

[JulianS]

The number of teeth on the speedo drive gears in the gearbox. 7 teeth on driving gear on layshaft and 10 on the driven gear which goes to speedo cable.

[TRIGWELL]

Thanks Julian - how you know and remember how to find these things amazes me! - thanks very much - ray t

[Willie Dee]

PMSL I thought it said OIL and was for oiling the end of the clutch cable.....everyday is a school day!!