Dodgy speedo

Hi everyone...I have an 80 series with a sometimes works sometimes doesn't speedo...does anyone know about these and what to look for? Its the electric type not the type with a speedo cable...

Sometimes it works fine and then will not work at all, occasionally when not working it will flicker for a sec...so seams to be electrical...

When its not working the millage counter also stops but all the rest of the dash works...

Help would be greatly appreciated...

Cheers...
 
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