Anyone know what would cause the temp gauge oil pressure gauge to peg to the right and the tach to stop working?
if it helps they are all 3 right in a row.

All working fine for first 30 min of the outing.

Might have lost a ground under the dash?

Is the ground "daisy chained"? Which would explain the 3 in a row.

Ground wire problem.

The ground is usually daisy-chained for gauges. Sounds like a classic grounding issue. Not hard to fix.