Speedo screaming like a siren as speed increases??

Hey guys,

After much sweating and swearing I have managed to reconnect the speedo cable connector to the back of the speedo...now when you start driving it's ok until about 30mph and then it starts freaking out and screaming like a siren as speed increases??

Video of issue below, needs sound on.

Screaming Speedometer!!!

I bought the car with the cable not connected & the seller saying he'd tried to put it back on but couldn't do it....now I know why he left it off.

Any ideas on...

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