Average fuel level problem on Vs calais

[L31GH]

i have a problem of the average fuel level being displayed as 0 ltr/100km and the average speed being 250 km/hr. This has happened after i took the cluster out to replace a globe from the speedo.

is it possible that i havent connected a wire back up?

thanx in advance

[fitzy2005]

prob the best way to fix that, would be take the cluster back out and take a look and see if anything looks out of place, or photo up here so others can suggest