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Replace the fuse.
87 Unleaded. But use 89 once in a while to keep the engine clean.
You have slowed down.
Not a question. Operator error.
Example sentence - You must pay attention to the speedometer on your vehicle while driving to ensure you obey the posted speed limits.
Speedometer, fuel gauge, and temperature gauge.
Needs crankshaft sensor and or camshaft sensor
One reason a 1998 Cadillac Deville would cut off while driving could be the fuel pump or the car is out of fuel. Another reason could be the spark plugs.
try tracing the wiring if an electronic speedometer it might have broken by the trans.
speed sensor
you are changing speeds
check the wheel bearing