My fluid light turns on after I start my truck! All my fluids are where they should be.

C'mon we can't see the symbol

 

Might be the Washer Fluid Light

 

With the symbol panel gone, that could just as easily be a check engine light....
In either case like I stated earlier, unplug the coolant level sensor, clean out the plug and plug it back in.

You might need to get it to a shop to get the computer to tell you which actual light is on. Unfortunately there is simply not enough information left on that panel to be of use.

 

And you got to hope the person that didn't remove the symbol panel didn't move the lights around...
Simple fact is the light panel is compromised so it's now not trustworthy.

 

Brake fluid??? Power steering? Antifreeze? Def? Tranny fuold, different ials