Grab a similar year cluster from the boneyard and transplant the tripmeter. You'll find it's connected to the odometer with a little plastic driveshaft. Not a big deal to swap. Just be careful you don't static-zap the dash cluster circuit board while you're in there, especially since the air is drier this time of year. A static buildup you can't even feel is enough to blast delicate chips on the board when you touch it, so make a habit of touching some metal grounded object first before reaching inside the cluster housing.
The really early trucks (moonie gauge era) were bad about breaking tripmeters. Later ones, not so much. What seems to break them the most is resetting while in motion. You're supposed to only do it at a dead stop.
Edit - BTW, the 95-up cluster disassembles a bit differently from earlier years. You can release the lens/bezel from the cluster with three tabs on the back side. Then use a plastic scraper tool or similar to gently pry the gauge fauce away from the housing. The black gauge face is a sticker applied to clear plexi; that's what you are prying out of the housing, so just take your time and be careful. What's holding it in are the studs on the back of the gauge motors where they press into sockets in the housing.
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Richard