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Clusters are a problem in these cars. Go on line and find someone who can rebuild it. Very low cost to rebuild. Tach and speedo get there signals from different sources so it is more than likely a cluster issue not a sensor.
If you google ( resolder or solder dodge Caravan dash cluster ) you find pictures etc that will make it easier for you. It's actually a pretty common problem around that year. The solder in the cluster where your harness and wiring connector attach (at back) gets cracked and what your describing starts to happen. It's a matter of removing the dash cluster, remove cluster/circuit board from housing, flip it over and just re-heat/re-puddle the spots where the solder is on back of circuit board where that connector attached. If you want more info, feel free to get back to me, but I expect you'll find a good picture if you google it. Good Luck, let me know how it goes.
Test the dash first. Put key in hold down trip reset botton. Turn the key to on but don't start. Release the trip botton. Should turn on all dash lights & check for codes in the odometer. If getting codes reply back.
sounds like an electrical nightmare! start by removing the cluster,now try signals are they working if yes then bad cluster, also i had a few caravans that just had bad connections i removed the plugs and reconnected them and it worked fine, also with the light coming on with your foot on the brake may be a bad or in correctly installed bulb, check all brakeand signal bulbs, try all of this , good luck,hope this is helpful.
These vans have had issues with the PIN connections to the instrument clusters. With time the solder on the main PIN connection will begin to fail. The good news this may be repaired at home. First you'll need to remove the instruments. To do so remove the dash components from around the instruments then the (4) screws) that hold the instruments in place. Carefully detach the wire connection from the back of it; take to a well lit area. Look for a PIN with a failed solder joint (this will appear as a slight black or grey circle. If found apply heat and let solder be gin to flow; the allow to cool and reassemble. If you look at my history you'll see I've helped others with this issue. The attached link may help: http://dodgeforum.com/forum/dodge-caravan/197192-99-grand-caravan-intermittent-dead-dashboard.html
Please let me know if this assisted you,
1. Check the resistance of the Output Shaft Speed (OSS) sensor. It should be 300-500 ohms.
2. If the resistance is out of range, replace the sensor.
1. With the key in the Lock position, push in and hold the trip odometer reset button until the word Sof and a number show up in the odometer display. This is the software version number of the cluster.
2. Release the button and the cluster will display codes in the odometer and run through the calibration points with the gauges.
3. Note any codes.
4. The cluster will exit the calibration when the word End is displayed on the odometer.