rusefillc comments

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                                            rusefillc

![image](https://user-images.githubusercontent.com/48498823/229264143-226734ca-fa5d-44fe-8065-dfb244680747.png)

![image](https://user-images.githubusercontent.com/48498823/229264234-af3971e7-062a-4e36-8a9f-3485dccc969f.png)

![image](https://user-images.githubusercontent.com/48498823/232887568-9320e0f0-2c8a-4f34-8102-0ea589c609aa.png)

@mck1117 do you remember anything relevant? which specific ADC pin would be preferred for one channel of knock?

@Creesic please turn this unit off

@mck1117 has a lot of spare units. @mck1117 are you interested to investigate this casualty?

![image](https://user-images.githubusercontent.com/48498823/149246284-0700f3f5-97b1-4f6d-87de-fd25b7d218e6.png)

@jyoung8607 I am interested in this PR, how is it going?

> Let me know if you have other questions, or if you have a supportable vehicle and would like to help. I do not actually use openpilot at all, my...

@sshane what's the process for this PR to move forward?