Not to mention that the Chrysler distributor end on a tach cable is the odd .152" tang style tip rather than the uber common Chevy .104" square drive...

I hate to split hairs but you really didn't see mechanical tachs in race cars until the late '60's, early '70s. I'm sure they were out there but when I look through my old mags, I don't really see too many when the AWB cars were around.

SW was kind of late to the game as well. Jones/Motrola had been around for a while but their tachs were seen more in boats and road race cars before they made their way into drag cars. Eventually tach drives became the norm but probably not until '69-'70. Just putting that out there, most people wouldn't care or bat an eye at stuff like that.

Drag racing evolved really quickly in the early years, seems like there was a paradigm shift every other year or so. If you think about it, AWB cars lasted less than two seasons before they gave way to tube chassis floppers.