Help with Accel position equation

Hello, I am running RaceChrono iOS with a 2019 Ford Mustang, and OBDLink MX+. I am able to pick up all of the standard channels, however the Accelerator Position only registers a range of 15%-85%. I have tried all of the various accel and throttle position channels, and none of them give a full 0-100 range.

I generally understand that I can create a custom channel that uses the same PID and an equation to convert it to a 0-100 scale. I know the basic equation will be ((X-15)/70)*100 where X is the default sensor reading.

I created a new channel, and used the same PID as the standard Accel position channel. But I assume I can't just paste my new equation into it, it needs some additional formatting. Hoping someone could help me with it.

The standard Accel position channel has this in the equation field: bytesToUInt(raw, 0, 1) / 2.5500
How do I turn that into the formula I need?

Thanks!
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