speedo stop working

[nick1973]

help my speedo has stopped working goes up to 20mph themn drops back to 0
i've just fitted a rns-e so it could be to do with that any ideas before i swap back to normal radio
cheers nick

 

[rodenal]

id check it on vag-com first mate incase it sthe instrument cluster thats ******

 

[nick1973]

ran vag com the speedo worked when tested but
fualt
00668 supply voltgae terminal 30
53-10- SUPPLY VOLTAGE TOO LOW-INTERMITTENT

ANY IDEAS