I tried my handset but it would not calibrate, I could monitor traction settings. I talked to a local Hyster dealership and they told me I needed an e-tach (spelling?) program. This unit had four controllers, one for each traction, one for pump, and one more, I am guessing an interface? This is the one that came up communication error on my handset, is this the controller I need to access to make calibrations to the pots? The fourth board, the interface, was a curtis pmc, the two drives were curtis sep-ex, and the other was a curtis pump controller. The problem with ohming is that is I was helping out a another tech who removed it, he broke of the head of the pot set screw so he was using vice grips to tighten it. You have to turn the steering to access it. I have no idea what the ohms on the pot were, or the position of the steering when it was removed so it would take a lot of trial and error.