I'm using an electronic speedo rather than the mechanical one on the type 9 box but is seems to be leaking gearbox oil.

Should it and should I find a way of sealing it and if so what?

An old cable might be the answer but just cut off so it does nothing. Anyone else had a similar problem

On the first type 9 in my pinto the speedo connection had been removed and filled over with some kind of metal filler.

When i swapped the engine and box the new one still had the connection and leaked slightly. we have tried a couple of things including cutting a new cable end off and fitting it, and bunging up the cut end. But it still drips every now and then.

I asked same question a few weeks back

http://www.locostbuilders.co.uk/viewthread.php?tid=49639

I now have an old cable end sealed with epoxy putty, sealed the whole thing to the gearbox with a little gasket silicone (oil resistant) and the original circlip.