[TenTec] S-meter calibration

[Barry N1EU]

Could someone please tell me how I adjust the s-meter calibration numbers
in the hidden menu (RX Menu, then push PWR) such that an s9 signal
registers s9, etc?

I first set the meter pot (access hole in top panel behind AUDIO button) so
that meter registers 100W when transmitting 100W.  Now I want to adjust
s-meter but I'm confused on adjusting those numbers.

Thanks & 73,
Barry N1EU