As homer52 mentioned, I installed everthing I could in the dashboard before installation. I made note of which wires were in the harness in the cab that needed to connect to the dash components and where they connected. I padded the steering column and anything else that the dash might hit and then hung it from the roof with some wires. It was face down so i could access the back from above. This way i could keep the wires fairly short and not have to try to coil up a lot of excess wire.
It was a bit tight, but better than trying to do it in place. No one will ever see that again, but I know it was done as cleanly as I could. I was glad I was able to re-use several of the electrical switches.
