There should be 2 bulbs to each gauge cluster( 1 each left and right side), plus 1 that lights around the ignition switch. Unless left 6v cant see all 5 blowing together.
I'd check the switch one the terminal that feeds the lights. Don't have diagram with me right now but I think it was centre top or dash end terminal on top the switch.

Last edited by 52vff; 08/15/2016 4:31 AM.

1952 Chevrolet 1700 Bickle Seagrave
"Old Smokey'"
Following the build in the DITY Gallery