cheapie off ebay is most likely the culprit, aftermarket sensors are pretty much a no no since they are so sensitive.

I know the speedometer is related to one of the rear wheel sensors, are you sure its the rear left? You probably should have gotten the car scanned to see what DSC codes you are throwing too, as the "yellow trifecta" of lights could also be related to an ABS module throwing random errors and needing repairs.

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2018 Ram 2500 6.7L Cummins 68RFE
19k miles -Bright White/Black - Big Horn Sport - Crew Cab Short Bed
2013 X5 35D (CEO's) - Born on 5/17/2013 -
82k miles - Alpine White/Cinnamon Brown/Premium Pkg, Sport Activity/Premium Pkg and Sound/20" Style 214/Running Boards