Engine light comes on and tachometer goes off?

If the engine light comes on and the tachometer stops working, it could indicate a problem with the vehicle's engine management system or electrical issues. Common causes include a malfunctioning sensor, a faulty ignition system, or a problem with the engine control unit (ECU). It's advisable to have the vehicle diagnosed with an OBD-II scanner to identify any error codes and determine the specific issue. Ignoring these signs could lead to more severe engine problems, so prompt attention is recommended.