trying to upgrade my 68 camaro dash gauges. i installed a tick tock tac, removed gas gauge, installed console gauges, where my gas gauge is now. all my console gauges work good. i installed a new circuit board on back of gauge panel, all new bulbs in sockets etc. here is my problem, nothing works on dash panel- no lights no tac- i see 12 volts at all the lights with a volt meter, i tried grounding the metal backplane, but still get no lights. did i miss something on installation??????