WAIT!
I have done this stuff before.
feed the rings for the tachometer and accessory gauges through the speedometer hole, once they are in place then feed the speedometer ring on its side will need to push it in, dont worry, you will not bend the ring enough to warp it.
then once that is all in, clean the rings with a light soap and water mix to get rid of fingerprints.
hope this helps, email me at
bhatia55@comcast.net if you need more help too