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UNO R4 wifi PWM, Sense Control of Fan

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I have 4 wire 12 V "PC" type fan with

Pin Function Wire color
1 GND Black
2 12V Yellow
3 Sense (tach) Green
4 Control (PWM) Blue

I am using a relay, operated from one of the pins on the Arduino and external 12 V source to power fans.

I need to start the fan, increase the speed slowly based some logic and use "Sense" control the speed of the fan.

I have tried many of the articles but seems they are either different than the uno r4 wifi or do not make use of the "Sense" pin on the fan.

Any ideas?

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