OEM dash/ wiring install

[Ryanl99c2500]

Hello everyone, I’m new to the forum, and looking for any help anyone can offer. I bought a 1999 gmc c2500, newer engine and trans. The only issue was the dash was off of it, and I don’t know what is supposed to be plugged into what, and how to put the dashboard back on. I currently have it apart, and somewhat wired up attached I will add a few picture. If anyone has any advice, or help please let me know.
Thanks.

 

[SUBURBAN5]

That dash is from a 95/96 fyi. I don't think the 2500 had a passenger airbag luckily. I see why it was swapped. The dash tilts on pivot points and pivots upwards, where then you would bolt to the firewall

 

[someotherguy]

Pretty sure you'll need to remove that bracket on the passenger side of the firewall. That's for supporting the passenger airbag (or storage compartment on the heavier trucks) that your 1995-1996 dashboard doesn't have.

Richard