That is neat. Never seen that one. Mine simply uses a pot going to the power conditioning board. It is a pretty easy fix, should have done this a long time ago. I am just putting a pot in a cast aluminum box running back to the machine through an xlr connector then to a 3dpt on/on switch that connects to the board and both pots. Mine is a 3020g BTW, 400amp output 100% duty cycle. I just dropped the pan and replaced the gasket, I will be needing a flywheel soon
. I really would like to find the sending unit for the fuel tank...I tried some parts off an old Ford truck I had laying around but it was not the right resistance range. Be nice to make up some new sheet metal for her and get replace that goofy muffler (it is loud) but that won't make it run better so it will wait.