2001 Tacoma

Need help radio quit working and before got home gas gage speedometer 4 wheel drive heater . what could this be

 

It could be a fuse. There are two fuse blocks in these trucks. One is under the hood, the other is on the left side of the panel below the steering column. You will need the little plastic fuse puller or smaller needle nose pilers to remove them. The lid (in the engine bay) and access panel (interior) have a diagram noting what the fuses are.

Here is a link on how to inspect the fuses:
https://www.yourmechanic.com/article/how-to-check-fuses-by-rocco-lovetere#:~:text=Step 1: Switch on the,each end of a fuse.

 

If all that stopped working while you were operating your vehicle, don't shut it off. You could have blew your screw in place ALT120A fuse in the engine bay. If you shut it off, you won't be able to start it up until the fuse is replaced.