anyone got pic of back of gauges/circuit boards for '68 barracuda/?

OMG, perfect - that is ralley '68, right? I should have mentioned that. Either way will help get me on right track - got a loose fuel gauge wire I think and a number of bulbs to replace..and the headlight switch ...on and on

it is bit of a hassel, but not impossible to take the complete cluster out, remove the front seats, you will have some room to lay on your back and reach up into the dash.
With the cluster out, ez to upgrade the voltage limiter, lightly re solder the pins to the circuit board, change out all the lights, generally R&R the whole thing.