If you're up for a no-start troubleshooting walk-thru, you can try here: https://mnharms.com/tutorials/disnostart/
Problem is, what with the dash being out, there can be any sort of asymetric set of issues in play that make it tough to work on via a forum...
Wild guess, sorry if I missed it, did you re-attach the ground wire next to the cluster? Is the center bolt tight on the ECU connector block?
About footwell wiring, there are large looms on both sides along the sill, next to the front seats. I've heard some instances of where they were subject to damage, etc. But I'd not be too keen on chasing things like that since you, again, had the entire dash out. I'd go back over everything you touched during that process, as well as doing it all over again, keeping an eye out along the way. Point is, my money is on the dash R&R, not something else, unrelated.