Help installing instrument panel back in

I'm assuming (by your handle) that it's a 70 Dart you're working on?
I have the same cluster in my '67, and I thought it went in easier than it came out. Did you unbolt the column where it goes thru the firewall? Doing so lets you drop the column a bit more & gives you a little more room to work the cluster in. Other than that, just get the bottom in first, hook up the 2 connectors & ammeter and it should slide right in.
Save the speedo cable for after it's in place. Be careful not to knock out any of the bulbs.