DIY Dash Bezel Resto - '66 Barracuda

I like to put in aftermarket gauges but how did you get them to fit into the backing of the front cluster. I test fitted gauges into the front cluster but what about the circuit boards and the thickness of the gauges. By the way yours look great

thanks
the gauges weigh so little that we tossed most of the aluminum frame - they're all 12v so tossed the circuit boards too