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I believe the part you were looking at would have been the Throttle Positioning Sensor. Hard to say for sure without seeing a picture.
The gear piece that you are talking about I'm guessing would be the star wheel that spins to apply tension or reduce tension(distance from shoes friction material to the drum). They often don't need replaced, unless they got knocked loose and got ground up in the drum for a while. It's important to dis-assemble them completely and clean all the rust off the threads with a wire wheel. Then it should work like new. You changed the wheel cylinder, but that shouldn't affect the ABS light at all. Just would be the cause of brake fluid leaking into the brakes and ineffective stopping power.
I'm not sure you found the sensor for the ABS, something else may be fooling you.
And plug wires often have problems when they touch/rub each other, so use the factory looms or if you need new ones, pick them up. An easy way to see if the insulation on plug wires is shot and causing an issue is to pop the hood at night with no lights on and watch for arcing to take place. I don't see the wires solving your problem though, unless they have been mismatched on cylinders or are missing parts.
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