Trip Odometer won't change.
 

I bought my 2000 GMC 2500 4X4 over a year ago and love it.
When I bought it, it was stuck in "Trip" odo mode and won't change so I can see how many actual miles are on the truck. Is there any way I can fix this without replacing the entire dash cluster.
I did have someone run a carfax on it about 6 months ago and found that the last recorded mileage was over 202,000 miles.
Any help from anyone would be great.
Thanks guys... and girls