Update: I changed the stepper motor on the speedometer and it still jumping. I got my new alternator but I haven't had time to install it. I'm also going to add extra body to engine and engine to chassis grounds. Hopefully this will work. I also found that some critter took residency in my under hood fuse block. I vacuumed all his left over garbage out but I think I need to clean the fuses and connectors. Is there a good safe way to clean this?