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I had a 1/2 ton GMC Sierra Vortex Max. At 50,000 miles it started doing weird stuff.
Tach would go from zero to pegged. Speedo would do the same thing. Flashers would blink radio would turn off and back on. Door locks would lock and unlock. The last time it did it I recorded it (driving thru Eisenhower Tunnel). Took it to my mechanic that same day. Showed him the recording. They had the truck for 3 weeks. Could not duplicate or find any issues. Mechanic jokingly said your truck might be possessed. One (other) hypothesis was that the mag chloride used on the roads was eating at the electrical connections. I got rid of it and bought a Durmax Diesel.
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