Is it possible the anti slosh module in the replacement cluster is wacky? I knew I should've swapped mine in to it before putting it all back together. Grrrr. I can't think of any other reason. Unless it's from jacking the front end way up to replace the starter some how messed with the float in the tank? The fuel gauge will go up to actual fuel level and then drop to empty and stay there. Then if the car goes up or down a hill, it starts cycling again.