996 (98) mech speedo is fixed on max!

[911Fiddler]

The digital speedo works ok.
The mech one sits at max all the time. Even when shes switched off.

Anybody know the cause before I start dismantling?

[911Fiddler]

Cherrs.
Battery reboot doesn't. Fix it.
Agree it's electronic. If I'm lucky it'll be a dry joint or a seized cog perhaps. Think I'll aim to transplant speedo electronics, eBay here I come....