Tried "Search"; Still Stumped

[Abner Mality]

Today, I lost the use of my fuel guage, temp guage, tach, turn signals, and brake lights in my 1980 300SD. Clock still works. Underhood fuses seem to be intact. I need help. While I'm at it, there are two inline fuses inside the fuse box, separate from the buss. Where can I purchase spares of those fuses before I find out the hard way what they control?
Thanks