I don't think its the sender in the tank, or the speedo sensor, it's gotta be somthing in the gauge cluster... maybe they share the same fuse...check a manual for the circuit dave
got the same exact problem.
there is probably a sensor on the transmission that is either gone bad or become loose.
why would a speedometer stop working on a Mazda
The speedometer and gas gauge going out tat the same time indicate an electrical problem. The instrument cluster may have to be removed and the circuit board checked for loose connections or cold solder joints.
If the speedometer and odometer doesn't work I would suspect the VSS (Vehicle Speed Sensor) is faulty.If the speedometer doesn't work but the odometer does, I would suspect the gauge cluster is at fault.
The problem would be that the car is messed up
Check all your wiring connections, it sounds like you have a loose connection somewhere, also check the harness plugs and make sure they are also tight.
sounds like a broken speedometer cable.
The gears in the speedometer are stripped. If the odometer is working then you have input.
TCM Malfunction, And/Or Speedometer Sensor Malfunction.
If it's an electronic (analog) speedometer needle, you probably have a problem with the dasboard grounding.
i would have to bet on the speed sensor