LED Dash Bulbs for 67 Barracuda

FJRdoc said

I installed LED's in my Duster 340 dash. The dash is restored and out of the car. Is there some way that I can check the lights now before it's installed to make sure the polarity is correct. I'm sure my 53 year-old neck and hands won't enjoy reaching up behind the dash once it's installed.

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Comprehending these printed circuit boards is easier than getting the rabbit to the Trix on a cereal box.LOL
Everything on the panel should be tested before install.
Testing each gauge isn't so simple without the proper equipment.
As for testing the illumination only... Each board holds 2 illumination sockets. Both harness connectors have a orange wire going to these corresponding pin locations.