Vito 108 cdi instrument cluster fault

Hi need help with cluster on my 2008 Vito van. When I switch on I get all the lights and fuel gauge switching on & off continually. Is this a problem with the cluster or is there a relay at fault somewhere? If relay can someone point me in the right area pls. I have tried to decipher the online electrical layout but it about as clear mud.
Regards Mick H