I'd try removing, then re-installing the slosh module first, to see if that clears it. They are available off of ebay for around 35 bucks. I bought one, as my gas gauge was completely inoperable. Then I purchased a new (used) Explorer (white backround gauges) cluster, and it had a working slosh module in it. I removed this cluster however and went back to the original cluster, because half of the dash lights did not work in the Explorer cluster ($%#@!)!
PM me if you are interested in my spare slosh module.