1986 Dodge Van gas gauge and temp gauge not working.

I was taking a 1986 Dodge 3500 van on a test drive and turned the AC up to test it. After just a couple of minutes, there was a poof of smoke through the vents and a odd smell. It seemed to keep running, but I shut the AC off.

A minute later, I noticed the gas guage and the temp gauge were down and not working. Surely, this is some how related.

Is this an easy fix? Thanks in advance for your help.