The V8 Owners Forum -

Looking for a solution for vittese box in p6.
Speedo reading 30, I'm doing more like 45 mph..
Is there a quick change of drive size or do I need to get speedo out gor modifications?
Cheers
Chris

Is it cable or electronic ?

I think there are drivewheels with different numbers of gear pinion teeth ?

or if electric, which is easier, you can buy electronic correction boxes. Although it says not available...I'm sure there are others out there

https://www.jaycar.com.au/speedo-correc ... s/p/AA0376?

Maybe electric only appeared on the SD1 I think ? Can't remember if it was electric or cable

Or give https://www.speedycables.com/ a shout

Hi
I've got mechanical drive, probably quite tricky to go to electronic system.
Thanks for the response and links.
Rgds
Chris

https://www.mgexp.com/forum/mgb-and-gt- ... e.4784920/

Speak to speedycables, I'm sure they can do something

Thanks man. Interesting about the 3d printed gearbox

Clyde Archibald wrote: ↑Sat Aug 23, 2025 4:51 pm Thanks man. Interesting about the 3d printed gearbox

Similar was available commercially a lot of years back for the mechanical speedo jap imports, to convert their kph speedo's to read mph.

DIY 3d printing....cool new version if you can do it.

Speedy cables and Speedograph Richfield will do a 'correction gearbox' to go in the speedo cable.
Speedy cables probably your best bet.

Chris.

Thanks will get round to it....thats the finishing touches......l have bigger items to snag first
Cheers Chris