Just had my full size dually 1999 7.4 classic dropped off by the garage and its came back with a weird fault it didn't go there with:
The speedo and RPM are not working, and the trans won't change above first gear.
No blown fuses. No check engine light. All other electrics working fine.
The garage is not open until monday now, I'm hoping this is just a case of them not reconnecting something and I can fix it myself, but since its dark now I thought I'd ask for some ideas of what it could be.
Any help? It would save me a lot of time.
Thanks,
Craig