Electrical failure

Hello All! I haven't seen this site for a while because I've been busy. I like the new look!! The search function seems better as well. However I couldn't find a reference to my problem.

My A/C compressor, brake lights, temp gauge, oil pressure all quit working at the same time. Could someone suggest what common components I should look at?

All fuses in the fuse box near the firewall are OK.

Thanks in advance for the help.