Just touching on this, do you need to reference the speed? If it's PWM, just have it turn down as it approaches desired temp. As speed increases, temp will drop and the fans will as well without needing to reference the VSS.
Just a thought.
William
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Texas A&M BSME 2008
1969 Camaro - Hugger Orange
1969 C10 SWB - Hugger Orange
1992 Corvette ZR-1
2021 Ford F250 Tremor
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