How do i know if i have a short in my dash panel 1995 Isuzu pick-up truck

My dash gauges don't work
John, If not a bad fuse,loose plug, bad ground, some of these dash, clusters were prone to solder cracking on the board and needing repaired or replaced.
Check the attached trouble shooting link. Good luck .
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None of my gauges will work but my turn signal indicators high beam...

Unless the vehicle was involved in a catastrophe earlier in it's life, the problem should be nothing more than a blown fuse.
Catastrophes could include a wreck or a fire, or even as little as someone trying to add a radio that was not installed by the factory.
If you find no blown fuse, an electrical expert can check with a electric meter to find out where your failure is.
God bless your efforts.