Dash Power wire?????

Ok i fixed my wiring behind my guage cluster and its all nice and cleaned up, but now i have no power wire. The guy before me ran a huge wire from the battery to an aftermarket amp guage under the dash. When i got the car i noticed some wires under the dash had been melted along with a wire on the amp guage , so i took out the aftermarket guages(amp,temp,oil psi) and took the guage cluster out and fixed it all up. Now i put the guage cluster back in and have no power at all :cwm10: (very angry) according to my wiring diagram i should have a main power wire running to a ammeter wth is that? I presume this isnt the amp guage inside the cluster cause the wires(according to my diagram) dont run there. I am so lost and am getting a huge headache thinking of how to fix this, where should i start to run a power wire to..from battery to where, what should i put in the wire so i dont have 12 volts running to something and melt more wires.

i am so lost now i dont know what to do? and getting a headache only gets me more mad