Just been having some troubles with the speedo and cable in a 68 deluxe when I bought the car the speedo didn't work
Just put the new cable in and still not working the cable isn't even spinning at the speedo end as I disconnected to see if it was the speedo
would it be something in the gearbox making it not spin?
any help would be appreciated

It sounds like it. There is a nylon bush on a spindle that spins around inside the gearbox. The speedo cable fits inside the spindle. They wear out easily so could be spinning freely, or it could be jammed. I would try changing the speedo cable first to ensure it's not kinked, just cas it's easier. If not you need to remove the metal clamp that holds the speedo end unit in place and check it. I will see if I can find my spare one and take a photo for you after dinner

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"Beware the lollipop of mediocrity: lick it once and you'll suck forever" Brian Wilson

Forgot to mention, the place in the gearbox where the speedo cable goes into is not easily accessible. Removing the carby (carbies) makes it easier but it is still challenging.

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"Beware the lollipop of mediocrity: lick it once and you'll suck forever" Brian Wilson

Take out the 1/4" bolt next to the bottom cable end, wiggle the cable bottom nut around without undoing it. The adaptor plate will lift off with the cable.

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DrMini- 1970 wasaMatic 1360, Mk1S crank, 86.6HP (ATW) =~125 @ crank, 45 Dellorto (38 chokes), RE282 sprint cam, 1.5 rockers, 11.0:1 C/R.

It's a brand new speedo cable I also replace the little rubber bush inside this part below

Try the speedo cable end in the shaft that drives it.
A bit of wear and they don't drive.

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DrMini- 1970 wasaMatic 1360, Mk1S crank, 86.6HP (ATW) =~125 @ crank, 45 Dellorto (38 chokes), RE282 sprint cam, 1.5 rockers, 11.0:1 C/R.

clovus do you mean the bush in the photo? Bit of a bad photo orange looking part?

Cheers doc I will try that