An electronic boost guage is simply a voltmeter connected to a boost sensor. The boost sensor outputs a voltage dependant on pressure. So the key is the sensor. Any number of aftermarket sensors exist, though just grabbing a good mechanical (not AutoMeter) boost guage is probably cheaper and easier.
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cool its a starting point i was thinking of useing a pic controller to read boost and vac from the transducer and other stuff like intake temp and such and feed it to a lcd controller with a programmable hey stupid light if the boost goes over a certain pressure