Electrica; problem

Im trying to find a common connection between your systems, but Im not finding all of them. The oil pressure and Speedometer share the "INDIC Fuse 10am". It looks like this fuse also ties into the rear defogger timer. Sounds like a good place to start. As far as getting a wiring diagram, Chiltons manuals have some diagrams that if read correctly can be very helpful. They cover a lot of models, so make sure you are on the right diagram, and good luck on your problem.