Got a feel for that old dash, eh? The key is the ballast and a good resistor. I once spent a whole afternoon swapping a 1957 Chevy's 30-watt bulb for a 15-watt one and tweaking the wiring to get the right glow—kept the cabin from turning into a lighthouse. Just remember to keep the wiring neat and test the output with a multimeter; a bright dash can be as bad as a dim one if it flickers. You’re on the right track, just take your time and don’t let the nostalgia fool you into skipping the fundamentals.