Tail lights and cluster light wont come on?

FORGET fuse 7. FORGET the dash lights. That is what I'm trying to tell you. The dash fuse WILL NOT have power UNTIL the tail lights work, because that tan wire comes OFF (after, fed by) the dimmer which is powered off the tail circuit

I'll get some things posted here

Download the 73 service manual. The wiring diagrams changed for the A bodies that year and are much different than earlier. Go to page 8-152 which is the index of what is going on

Go to page 8-115. This is a list of what all the fuses supply. "Car line" "V and L" is for the A bodies

CAVITY 5 is the TAIL LAMPS and is the one you should be worrying about for now

Notice the listing for "CI" INSTRUMENT PANEL, page 8-167. These are pictorials of all the connectors under the instrument panel.

Wiring diagrams start page 8-154 On page 8-153 you can look up the headlight switch and see it is at location C10

FInd C10 which is page 8-156 Notice the switch says "CI-2" This is what the lamp switch connector will look like.

Look at the top of the switch where it says B2. This is "battery feed 2" (B1 is headlights)

See that L8-18P ? That is a no 18 Pink, which goes off to the fuse in cavity 5 the tail light fuse

The diagram for the lamp switch connector is CI-2 on page 8-167

The diagram for the fuse panel is CI-28, on page 8-169

The wire L8-18P (Pink) is tail / park / dash power "coming in" to the switch and should be hot all the time.