I also have the same problem with the same year car. I gave up on trying to fix the dash cluster. Expect for your Dash Cluster to go out completely. Please check out the key words search link below for "Dash Cluster" in this forum.
Good Luck.
PS
I've been driving my van without knowing how much gas I have, How fast I am going, etc for about a year now.
http://www.automotiveforums.com/vbul...archid=2103182
http://www.automotiveforums.com/vbul...t=dash+cluster