2007 KW T2000 c-15 Gauges not working!

Do dash lights work. It could be a loose connection.
If so, check wiring harness . Follow harness from motor to around trans to cab.
Also check grounds.
Check behind dash also.
Good luck

 

Maybe take it back to the shop that did the rebuild. Apparently some things were not re installed or connected properly. Or....remove the transmission. That usually solves the problem of non working gauges. Lol

 

Like today's cars, instruments and such are all multiplexed together and tied to the computer. Any split-second interruption at any connection starts the 'puter into reacting, sometimes, to a momentary interruption in information as gospel and reporting the situation until reset. Sometimes the stupidest connection or loose ground is all it takes.

Start looking for and damage in the wiring and be suspicious of and wire terminals bolted fast for a ground without a wire. Something that was intermittent [OP mentioned some wonky gauge performance before overhaul] may have been yanked out because it was that ONE ground hidden out of sight that everyone overlooks. Look for slash and twist CB/music/whatever power hookups. It is going to be an adventure. You may find it right away or it might take years.

Wife had an '06 Impala That would sound an alarm and read Low Oil Pressure - shut down now! Pull over, shut it off, got out checked the oil and looked for signs of an oil loss. Nothing. Start it back up and life was back to normal until the next bump or whatever caused a, probably corroded connection, to loose contact for a mili-second and off goes the alarm bells....now driving down the interstate and for the 100,000th time you know it OK but you can't silence the dam bell until one can pull over and re-start hoping it wasn't going to repeat a mile down the road.

Traded it because nobody could find it...