Temperature gauge and speedometer not working

Welcome to 2CarPros.

Did the problem just start since you replaced the battery or is it ongoing? What I would like you to do is put the cluster into self diagnostic mode. No special equipment is needed and the codes may be helpful.

Here are the directions:

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1998 Dodge or Ram Truck Caravan FWD V6-201 3.3L VIN R MFI
Cluster Diagnostics/Calibration
Vehicle Instrument Panel, Gauges and Warning Indicators Testing and Inspection Component Tests and General Diagnostics Cluster Diagnostics/Calibration
CLUSTER DIAGNOSTICS/CALIBRATION
SELF DIAGNOSTIC TEST
To activate self diagnostic program:
1. With the ignition switch in the OFF position, depress the TRIP and RESET buttons.
2. While holding the TRIP and RESET button turn the ignition switch to the ON position.
3. Continue to hold the TRIP and RESET buttons until the word code appears in the odometer windows (about five seconds) then release the buttons. If a problem exists, the system will display diagnostic trouble codes. If no problem exists the code 999 (End Test) will momentarily appear.

INSTRUMENT CLUSTER DTC CHART
DTC .................... Description
110 .................... Memory Fault in cluster
111 .................... Calibration fault in cluster
905 .................... No CCD bus messages from TCM
921 .................... Odometer fault from BCM
940 .................... No CCD bus messages from PCM
999 .................... End of Codes

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Try this and let me know what you find.

Joe