Help with Navaid Install

I am building an RV-6 and was installing and setting up the Navaid (I got it with the kit that I bought - not ready to invest in a better one yet). I think that I fully understand the instructions. However, it keeps referring to a "Trim Range" trimpot. I understand what it is supposed to do, but I cannot find this trimpot anywhere. My unit has four trimpots on the face (Gyro null, Span, L & R Cal). Each of these is also referenced, so I don't think it is a mis-label.

Can anyone tell me where to find the "Trim Range" trimpot?

Thanks for your assistance.

Larry