I'm betting Barry is correct - the sheet has "#" (shift 3) - the code in question should be Y93 - which is still "show car finish B/less gas" in '72

I'd also bet the decode by Galen predates the code book you are using for reference & the fact that Galen saw a sheet with "Y9#" lead GG to add that code to the following editions of the '72-'74 book