Actually, a couple years back I actually made a couple dozen "Low-End Menders" that were just that. They did have an IVS input but they also had a toggle switch to turn them on and off.
I used a 5K ohm resistor in series with a 5K-10K potentiometer that was user-adjustable.
I'll draw up a schematic tonight for you.
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Tuning, flashing, burning chips, and repairing all aspects of 7.3L Powerstrokes.
SEVEN 7.3L-powered vehicles in the driveway. Two didn't come that way from the factory!
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