’13 Sportsman 500 tach won’t work, stuck on 600 rpms

So I went to turn my sportsman 500 on the other day and noticed the tach reads 600 rpms and doesn’t change. It even reads it when the atv is off and the key is just turned on. Does anyone know what the issue could be or point me to a connection somewhere that I could check for water damage/rusting of prongs. The speedometer also quit working a couple months ago but the tach still worked fine, so if anybody has a suggestion on that I’d appreciate it too! Thank you.