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Tacho Full of Treacle

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kent400:
The tacho lubrication is only at the drive end, the speedo has shafts and gears that drive the trip and mileage counters that are lubricated. Both gauges have dampers that contain a silicone grease. It could be the case that the damper grease has dried out although that's usual. If there's corrosion on the outside of the base there's a good chance it's corroded on the inside also. As the mechanism contains a rotating magnet rust flakes are attracted that become jammed under the magnet cover. That can cause the problem described.

As for band removal, a hose clip secured around the band prevents it spreading outwards as the edge is lifted from the base. Once the band is lifted a small amount needle nose pliers can be used between the inside edge of the band and the outside edge the hose clip to bring it to vertical. This method can be used on gauge bezels where the glass is housed within them.   

Chris400F:
Thanks for the hose clip suggestion - that sounds a good tip.
I have another tacho which had obviously been opened in the past without using this trick and the band had spread outwards.
Can't find one large enough in my garage so have ordered a cheap one one from eBay.
Also have got some Isopropyl Alcohol which will hopefully do the cleaning job, have silicone grease already if needed.
C

Bodd:
You don't need a big clip if you are careful, I've had mine apart again since I originally changed the dials to get rid of the idiot lights in it ( 1/4 way down this page), there was no outward spread either time, I would think a clip would get in the way, patience is the key.

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