Odometer, speedo, trip doesn't work...suggestions on what to check?

After driving my car today, my speedo just quit on me. The only thing I actually messed with during the rebuild was the speedo gear going into the tranny. The speedo/odometer/etc...worked for about a mile of driving and then just quit?

I know the speedo gear didn't look to good when I put it in...but it had did fine all along. Just kind of a coincidence...so what needs to be checked to cancel ideas out?

I figure it is the speedo gear...I guess I'll pick one up...

Just bored and it is late..

I wonder if while it sat, something dried up not being used...and the 50resto speedo cable I got broke...but either way it is weird and a bad time to break when I'm trying to watch my miles on a new engine