[Dave at Pelican Parts]

It would have to be a very clever device. You might be able to do it with a solid-state MAP sensor, plus a whole bunch of circuitry to read the sensor and fiddle with other components to produce a variable amount of inductance depending on what the MAP sensor was reading.

Consensus was, last I checked, that it would be a massive PITA and might even cost more than a rebuilt MPS.

--DD