Instrument panel

I always work on my dash instruments on the bench first. With a 12v power supply I check all the bulbs and sockets. I may also tickle all the gauges to see if they have movement. I also check the voltage regulator for proper 5v output with 12v in. After the bench test I install it into the dash and carefully hook it up then do a final instrument and light bulb check before I wrap it all up.