Ahh, need help ASAP!!

Okay, so I got some amber bulbs for my cluster to install… removal of cluster and insertion of bulbs were fine. Here my problem: I’m trying to reinstall the cluster but the speedometer plug will not go back in!!! What should I do to get it to sit and “click” into place?? Any help would be greatly apreciated as soon as possible. Everything else works, lights accessories tach, everything. But my speedometer won’t budge when I accelorate. So I looked at the plug and it’s just not plugged in all the way. It’s so hard to get my big arse hands back there, but it’s just not going in. Help thanks

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