Speedo over-reading

[Rampmonkey]

Evening!

 

Got a constant and consistent 10mph over read on my analogue speedo. Not unworkable but I'd like to try and sort it.

 

Any ideas?

 

Cheers!

[shn7]

Do you mean mechanical? If so aside from changing tyres/gearing or sending it away to be recalibrate I don't think there's much you can do.

 

If it's electronic then there are dip switches under a grommet on the rear. A search should get you the settings.

[Rampmonkey]

Yeah, it be mechanical! I've yet to own a seven where the speedo actually worked properly!

 

[Jonathan Kay]

Use a GPS device to get true values. Then Letraset to add a few marks to the glass.

 

Jonathan

[Mike Biddle]

All car speedos over read because law says that they are allowed to be up to 10% fast, but not allowed to read slow at all, so manufacturers play it safe.

 

Edited by - Mike Biddle on 23 May 2012 08:06:31

[John Vine]

Quoting Steve Newman: 

If it's electronic then there are dip switches under a grommet on the rear.

Or, if you have the latest CC/Caerbont programmable stepper-motor unit, you can set the wheel revs/mile to an amazing degree of accuracy. Even then you'll probably have to choose between optimistic speed and accurate mileage, or accurate speed and pessimistic mileage. (This won't help the OP one jot, I'm afraid, but may be of use to others.)

 

JV