F6640SL Tach/hour meter problem

[Jackfr]

Since replacing Alternator, the charging circuit and Tach seem to be working ok. But another problem has surfaced. The hour/proof meter is not moving/working and it appears now that it has not been working for a while. Probably since the alternator started acting up last Fall. Also the diff lock lock light is on even though the diff lock is not engaged and when using the directionals while one indicator blinks the other is on solid. The fuel gauge has not worked since we purchased the tractor. We pulled the dash and checked the connections and checked for a bad grounds but could not find one. Any suggestions on where to look for other grounds or could it be the Dash module going bad?
We added an electric hour meter so we could monitor the tractors usage for service purposes today.
Any help would be appreciated

[RickB]

All I can say is your turn signals are operating normally. I'll get back to you later on some of the rest.

[Jackfr]

Thanks for your Reply Rick I hoping you have some easy solution for the rest of it.

Jack