Not 100% sure if this is in the right place, but anyhow....

I really need to sort out my Speedo inaccuracy. It over-reads by way too much and I want to try and sort it before the driving season gets going proper.

It is a Type 9 5-speed box mechanical drive via a 90deg adapter to the speedo. I know there are different ways of sorting it, but what is the collective view on the best, and cheapest!, method? I know the uber cheap route is to make a new face for it, but I don't want to do that if I can help it as it will just end up looking tacky

Thanks.

JB

Have similar speedo prob, (i.e. reading too high @ 70mph), during IVA Dynaroller test. Gotta get it fixed before re-test, so I will probably use these guys :-

http://www.speedycables.com/index.html.

Not cheapest solution, maybe, but at least it'll be right. Am also using the 90deg adaptor on my g/box, via custom-made speedo cable.

there are different speedo driven gears available for the type 9 (22 & 23 I think) as well as different driving gears (8 or 9? but changing that requires disassembly I think?)

some useful info here:http://www.duttonownersclub.co.uk/Members%20subweb/pdf%20files/speedo_calib.pdf

HTH

Jim

I've just put in an electric sender - type 9 box
Stepper motor speedo - Dead easy - spot on.. Ford Speed Speedo Sensor Transducer Odometer 95FB 9E731 AA | eBay

Brown Earth - Black Live - Yellow- sensor

[Edited on 12/3/13 by johnemms]

I have used Speedy cables a couple of times, very good service, but can take up to 4 weeks door to door

Ive been playing with speedo downloads for iphone, and the current one "speedometer" does exactlty the same as the tomtom

I will be using the phone as well, once the weather picks up

Some but not all radar speed limit warning signs are as accurate as most tintop digital speedos ie they read fast by about 1 to 3% --- with your tintop look for one that gives a reasonably sensible reading an use this to get an estimate of your % error. Speedy cables can use this to set up your speedo to get rid of the error.
Alternatively

If you have a Smiths speedo in a tiny font near the bottom of the drive there is a 3 or 4 digit number this is the number of turns per mile of the speedo. Standard Ford speedos istr are 1000 tpm as are Triumph.
If you work out the tpm of the speedo cable you work using this as a basis.


For example with 185/70 13 tyres, a 3.89 diff and a Blue driven gear in the gearbox you get almost exactly 1000tpm of the cable.

[Edited on 12/3/13 by britishtrident]

Thanks for the replies chaps

quote:

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Originally posted by johnemms
I've just put in an electric sender - type 9 box
Stepper motor speedo - Dead easy - spot on.. Ford Speed Speedo Sensor Transducer Odometer 95FB 9E731 AA | eBay

Brown Earth - Black Live - Yellow- sensor

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Hall effect sensors need power and earth.

quote:

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Originally posted by britishtrident
Hall effect sensors need power and earth.

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