Speed Sensor/Speedometer Issue

#1
felt like tranny was acting up when accelerating from a stand still . i installed a new speed sensor and re-did the battery terminals , they looked poorly connected to the wires. the speedometer was working much better but not perfect sometimes when i stop the speedometer kinda hangs @ 15mph then shoots down to zero. i inspected the wires they look okay, i tried buying a new 3-pin female connector that attaches to speed sensor but a well known parts store said they dont carry it and they wouldnt help diagnose whats wrong, any help would be greatly appreciated, thanks.
 
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