The 8K tach is either an assembly line anomaly or previous owner swap out.
Every factory S-code I've seen (with a tach) had a 6000-rpm unit.
The 8 grand tach you'd see on Shelbys and 428 Mustangs.
As the drill sergeant said, "I taught you everything you know. I didn't teach you everything I know."
"Human beings, who are almost unique in having the ability to learn from the experience of others, are also remarkable for their apparent disinclination to do so."
- Douglas Adams