New speedo won't work

[tcmiller69ss]

I rencently purchased a Covan's dash for my 69. The install went well except I cannot get the speedo to work. Replaced the cable drive with the specified sender from Autometer and wired it up. The speedo is programmable but no matter what I do the needle bounces all over the place. I'm stumped any help would be appreciated.



Thanks,
Chris