83 DL dash swap

[SubaruWagon87]

I decided to finally pull my entire dash out (without pulling the windshield ) and put in one from an 82 GL. I just got it all pulled out (the one from my 83), and wanted to make sure the gauges would work, so I plugged in the two plugs that fit (one didnt, so I left it there) into the gauges from the 82 and hooked my battery back up and turned the key on. None of the gauges on the 82 dash work, so I'm wondering, am I going to have to undertake some sort of massive wiring carnage, or is it a few simple connections?