I just installed an autometer 3-3/8" sport comp speedo and tach in my '69 dash, its actually very easy to get it to fit, even with the stock lenses/idiot lights over them. all you have to do is cut out a hole in the back of the carrier big enough for the back of the gauge to stick out, and in the case of the left pod i had to fabricate a small bracket out of aluminum to hold the speedo in place.in all, it was about an afternoon of work, and im pleased with how they turned out.