What does the white wire clip to?

Update on the white wire and dash lights. Well I took my time and went through the wiring schematics I think I' really beginning to understand them. First of all the white wire did in fact go to the connection on the back of the wiper switch. That problem is solved. Now I traced the orange wires from the firewall circuit breaker it then goes to fuse box under dash then feeds to the two 5 prong connectors on the back of the instrument cluster it also branches off from the fuse box to illuminate the radio. I checked multiple points along the orange wire with a test light to see if there is power. Power at fuse box on instrument fuse yes. Power at orange lead to illuminate radio yes. But still don't have any dash lights. Directional works, hazard lights work, brake lights work, and dome light comes on when light switch turned to left. Funny thing is when I switch off lights gas gauge reads accurately when lights are on gas gauge dies. What the heck is going on? I'm determined to fix this.

Carl