I just want to clarify something if you are creating a new system using wtp's instructions. You mention that you programmed in the red and blue frequencies. Did you program only the "Mesa Simulcast" site, or the red and blue from all sites?
I would start with the "Mesa Simulcast" freqs only. This is the only site that carries talkgroups you are interested in (Mesa PD, AJ PD, etc). If you put in the frequencies for another site like Thompson Peak or Shaw Butte, you won't hear much as not many talkgroups are carried on those sites. As an example Fire Talkgroups are frequently on Thompson Peak, but on Mesa PD or AJ PD.
When you press hold while seeing "ID Search" scrolling across the screen, you should see 852.825 as the active control channel. This is the current control channel frequency for Mesa Simulcast Site at the time of writing this post.
On another note, you don't have to worry about the rebanding link posted by wtp. This is a pure P25 system and this does not apply. This is also mentioned in that link as a note under the General Section.