how to test my crankshaft sensor in a 1992 honda prelude s 2.2l?

Today while driving to work my tachometer kept going in and out well when i turned the car off went into the bank came back out it would not start.it would turn over but not start.i pulled the plugs off the coil and there is no spark coming from it. i talked to a friend he mentioned the crankshaft sensor and i bought a multimeter and i dont know how to test it or what to put the setting on the multimeter.could someone walk me through this process step by step.
 
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