Hey guys, so I have a 99 Buick Century and have two questions.

Recently check engine light come on, plugged my OBD II and it said it was the crankshaft position sensor.

I first like to understand how there is 2 crankshaft position sensor on this car... one is plugged into the back of the block and other one seems like just some kinda harness that attaches to the front of crank pulley. I replaced both anyways just so I can get the code away.

Now the code is off.. but my car vibrates like crazy, just going past 25mph it gets scary so I had to park the car right back.

To get one of the sensor off, I pulled the harmonic balancer off since it was necessary.. I used proper tool for both removal and installation, I don't think I stripped the crank threads, at least not that I see or feel.

I have two, maybe three questions... here is some pic of the balancer I pulled off.
Before this job, the car had the engine code but no vibration, so I don't think the balancer is physically bad but what do you guys think? do I need a new one? It does look old but the rubber seems to be intact, no sign of crack yet.

Second question is - after reinstallation of the balancer, I feel like I might have pinched one of the crank position sensor thing? the blue wiring thing that attaches to the front.. please see pic. Is this damage acceptable? does this mean that I have overtightened the balancer reinstall? so far the car doesn't pull a code so I'm hoping I don't have to buy another sensor as it was kinda expensive..

Thirdly I found some RTV-like materials inside the inner bore and the notch thing.. so I am about to clean those off very nicely and try the reinstallation again.. but could that have caused bad install to a point that it vibrates?.. how do I know when the balancer is fully seated? in idle when I watch the engine visually, I don't see it rattling much(if anything my tensioner seems more moving than the balancer). I manually tightened the center screw after installation tool doesn't let me turn the wrench anymore.. and to finish I just use impact gun to torque it because I just couldn't find way to stop the motor from turning as I torque - my impact is rated at 200lb so I know it's somewhat perfect.

What are your thoughts guys?
Balancer is expensive locally and if I need a new one.. I'll order online but it'll take like a week and just doesn't make sense that this problem wasn't around before I did this job.

Thanks for the help guys.. it's my first post here.

Mario