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, PCM flashing, and burning chips for 7.3s since 2008. Repairing all aspects of 7.3L Powerstrokes for 25 years.
Eight 7.3L PSDs in the driveway including a 1994 Crown Vic and 1973 F100/2002 F350. Looking for the next victim.
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