1967 fender tag question

I was looking at a 1967 barracuda yesterday, and on the fender tag, under the capital "T" was the number 4. I've checked a few fender tag decoder sites and I can't figure out what this option was. Maybe it was actually a 7 (tach) and I misread it. The gauges were missing so I can't be sure if it had a tach. Does anyone here know if 4 was an option under T?