I am afraid that we cannot make a deal but I am in need for a speedo gear for my +8. Are you able to guide me in the right direction, please?
I did the same conversion on my 1976 Plus 8 many years ago.
From memory, there were two types of speedo gear fitted to the LT77 gearbox (I will have the details somewhere); the number of teeth are different.
I had my speedo dial recalibrated by Speedy Cables who also supplied me with a new drive cable as the fittings are different to a P6 four speed gearbox.
Let me know if you want any other information.