Adding a foot pedal to an Everlast Powerarc 140

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I have seen the harbor freight foot pedal mods and have been thinking of getting a little everlast stick/tig for field work. The Everlast PowerArc 140ST looks like a helluva deal and if I can add a foot pedal (using one of my existing pedals) then it is even better. The dual voltage is a must for me, but having a foot pedal (or fingertip control) would be great. It seems to me that you could wire the foot pedal potentiometer (pot) in series with the pot on the machine and use a SPDT switch to choose between local and remote (pedal) amperage control. The machine pot would still control the max amperage and the pedal would vary the current from 0-100% of the amperage on the panel. All of the info i have read insists that the two pots have the same resistance value, but these mods seem to bypass the machine pot altogether (thus replacing the machine pot with the pedal pot). In this case, it makes sense that the resistance values must be the same. If you are putting the two pots in series, do the resisance values have to be the same? It would seem to me that if you put them in series and a pot is simply a voltage divider then the current through the pots in series would be lower than the single pot on the machine and you would be safe from frying the machine. Am i missing something here?HTP Invertig 201 w/coolerLincoln Pro-MIG 175Lincoln Squarewave 300 TIGMM251