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took Rachel my blue Ital for a test drive after a full build up over the last 2 years
the speedo was reading well over what the Gps was reading
it has a 1.7 box but a 3.89 axle the box has an orange speedo drive 20 teeth and a dial set that could of come of out of a 1.3 or 1.7 not sure and running 175 70 13 tyres.

I have some different speedo drives to try do I go less teeth or more teeth to get the speedo more accurate
thanks baz

It is my understanding all speedo heads are the same. The turns per mile are written in little print around the outside of the face. Most BL / Smiths speedos ran on 1000 turns per mile. I have a post on here with the different options of speedo drive gears and part numbers when Renzo had similar problems
Dave

Hi Baz I thought that I had posted previously, but all you need is a black speedo drive. It’s what Austin Rover used in the 3.89:1 axled 1300 Itals.

cheers Chris
it's a bit of a mixed set up so wasnt sure which way to go
David confirmed that the speedo are all the same as wasn't sure if I had put clocks on out if a 1300 or 1700
many thanks
baz