Speedo Fault

[PRH]

G'day all
i recented fitted an L 3 dash in me ute,at first all was good with the speedo and now it reads low IE 20 km when i'm doin 60 km,if i give the dash a tap it will jump up,anyone got any ideas.
I still have the L2 dash here,would the speedo head minus the odometer fit by any chance.Thanks in advance
Phillip

[lgnd3800]

take the dash out and theres some nuts at the back make sure theyre tight as theyre the connections for power and stuff, i had the same problem

[PRH]

yeah i'll do that,i got it off ebay and it worked ok for a while.
Thanks regards Phillip