There is a ring with metal tabs that connects the speedo drive gear to the hub. It's pretty common for the tabs to get flattened if you put the wheel on without lining them up correctly. When the tabs are flattened, the speedo won't work. You should be able to take the front wheel off and straighten out those metal tabs to get the speedo working again.
Originally Posted by Zaboo65
Also, I changed the tube on the front wheel and must not have gotten the speedo set correctly since it has not worked since. Does anyone know do I just need to readjust at the hub or am I going to need a new speedo?