lost power to speedo, tach, headunit, and obc

[RUFFLZ]

While I was tidying up all the wires behind the head unit, something shorted and I seemed to lose power to the functions listed in title.
I know I know, I should've unhooked the negative but I wasn't thinking.

How can I troubleshoot this problem?

[Kershaw]

Check your fuses.

[RUFFLZ]

Check your fuses.

bingo
it was fuse #12 and #21 that were blown (for anyone that may come across this issue later on)

[robo_trigger]

Also for anyone whom has this issue and fuses check out okay, all these functions are powered by wires that come from a factory splice under the carpet behind the drivers kick panel. If a little moisture gets in there and 20+ years later copper wire can and will turn to powder.