confused again

[acl]

working on getting temp gauge to work and looking at past post and FAQ and seen a couple of mentions of moving or changing wire positions in the fuse clusterif you are going from a light to a gauge. anyone know of this to be true.i don't know what the truck was orig. The gauge seems good and pegs when grounded. is there a way to ground it somewher to see if grounding is the issue. i'm not sure if i'm am getting good ground from motor to cab. help if you can. Gary