Andy, my own '65 had a trio of SW gauges mounted under the dash when I got the car in 1982. Because I had a rally cluster, they were redundant, but these gauge clusters were very popular back in the day. I removed mine about 4 years ago and re-connected the oil and water gauges in order to 'clean up' my interior. That said, an aftermarket gauge trio is a perfectly acceptable modification, 'period correct', and is easily 'undone' if you don't like it. The one or two small screw holes are out of sight under the dash, and can even be filled and repainted if you are a fanatic. (I left mine there, as the dash is original paint and I didn't want to change anything). I say go for it if you want.
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Jeff 
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