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...Also the ac compressor doesn’t kick on.
Tach, charging, and AC compressor will be inoperative if there is no ESS signal. But as others said, that should not affect speedometer or odometer. As said above, look for something in common
 
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Do you have a clamp-style amp meter, or an inductive amp pickup you can connect to a regular multimeter? Here's an interesting article describing how to find s shorted sensor. Summary: test the power draw of multiple 5V reference signals - a shorted reference wire (and I should think an internally shorted sensor, too) will draw more current. Note that the amperages are very low, even for the shorted sensor.

The '96 FSM says the sensor troubleshooting procedure is in the powertrain diagnostic manual. JimDuchek posted about the manual here: 1997 Powertrain Diagnostics Manual -- Merry early Xmas

I didn't see the powertrain manual in the FSM stickies, but if it's there - even if for a different year - the ESS testing should be the same as far as resistance values
 
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