Intellectronics cluster Speedo issues
 

I have a 1980 Corvette C3 that we installed the inteletronics Clusters in the problem that I've run into is that my speedometer seems to be all over the place I've tried everything to correct the issue I've even spoke with a teletronics multiple times their customer service is friendly for about the first 10 seconds and then from that point on they pretty much want to tell you you don't know what you're doing and they have other stuff to do so I'm reaching out on the forms to see if anybody has ran across an issue with their speedometer bouncing all over the place with these gauges and what they were able to find to fix it or if they just gave up like I'm about to

If you have the Speedo sensor attached to your transducer, loosen it up and see if that helps. I had to put a spacer on mine so it would not bottom out and bind