Pulled Cluster Wont Start.

i disconnected the positive wire only. and tightly reconnected but i will have to go back and clean the post and cable for a better connection but if it was that couldnt that have been an issue before or no?

THIS ^^^^ happens all the time on my 5th Ave. Corrosion will build up and everything will seem like it works until you hit the key to start. Take both pos and neg off clean everything up with a battery terminal cleaner (wire brush) and either put some dielectric grease or regular grease on the terminals. Hopefully that fixes your problem.