Transmission help needed

Transmission seems like it is skipping 2nd gear. Had a diagnostic done to it & was told it was the 1-2 shift solenoid. I replaced that & still have the same problem. Nothing works on my dash anymore except the backlight & check engine light (obviously right). I don't know if the dash could have anything to do with this, or is the wiring harness inside the trans bad? There was & is no noise when I'm driving which makes me believe that the internals are ok. It just waits till about 2800 rpm before shifting. I was lucky to find that out before the dash crapped out. Any help would be greatly appreciated