The easy way is to use Scan125
However the manual way is to:
1) Press Search [Srch] button
2) Press Hold [Hold] button is scanner starts searching
3) Press Function [Func] button
4) Press Program [Pgm] button
You should now see a menu:
Save Frequency (highlighted)
Program Limits
......
......
5) Use Scroll button to select/highlight "Program Limits"
6) Press Enter [E] button
7) Use Scroll button to select/highlight "Search Bank n" where n is the number of the bank you want
8) Press Enter [E] button
You are now on the edit screen for your chosen Search Bank - will default to "Lower" and show the current frequency
9) Press Enter [E] button
10) Enter 163.0 on keypad
11) Press Enter [E] button
You are now on Lower with the new 163 frequency
12) Use Scroll button to select/highlight "Upper"
13) Repeat steps 9, 10 (enter 174.0) & 11
14) Press ./Clear [Clr] button repeatedly (goes back through menus) to get back to "Search Mode"