It's a lot of extra work to custom fabricate gauges to fit into the original housings. I restore gauges to original, if that be standard or rally. For '64 Lemans or GTO there were no gauges, just a clock or a tach in the 4th circle opening (which is so tiny it is almost unreadable). A better & much faster solution would be to check into a set of '65 Rally gauges. The mounts are the same and 65s will bolt right into a 64 housing. You would have to change the senders for all 3 gauges though. Oil, water and fuel. Pete