Just to relay my experience -- I am on my 3rd Gemo replacement and I am still wobbling/bouncing/vibrating in varying degrees on my 300TE.

I'm beginning to believe it could be the speedohead itself now. Just keep this in mind. I cannot believe 3 different cables were of equally bad quality. I replaced 3 times due to thinking I kinked the cable during install, but now I doubt it.

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2016 Monsoon Gray Audi Allroad - 21k
2008 Black Mercedes E350 4Matic Sport - 131k
2014 Jeep Wranger Unlimited Sahara - 62k
2003 Gray Mercedes ML350 - 122k