Re: 99 Jeep grand cherokee 4.7 p0500 no speedometer
The connectors for the rear wheel speed sensors are hidden under the carpet under the rear seat. Not sure what the resistance should be, but compare the left rear sensor with the right rear sensor.
Best would be to scan the ABS system for faults. Besides speed sensor(s), it could also be the ABS controller or even the PCM. Did you check all fuses first? A blown ABS fuse for example would already cause no speed indiaction.