Oscarsnz1

I’m having a hard time. So I bought my 350z about a month ago. Got it for a good deal knowing it had a few issues one being the A/C and heat does not work and my needles on the cluster don’t move. The guy said everything worked before he installed the hydro he thought maybe a fuse or a ground was left undone but, I pulled the head unit and the navigation and everything looks good. I’ve check all 3 fuse boxes all the fuses look fine. I have also read that the cable wire on the climate control amp goes bad so I ordered on and replaced it and nothing . Do you guys think I should look into maybe replacing the whole amp?