Neither, and both. The Revburner, and by extension the Pro-Gauge, which uses the same interface, drive the cluster in the same way the ECU or ignition would. The actual mechanism that moves the needles is irrelevant.
Simply put, they emulate a car.
Specifically a car that isn't old enough to use mechanical gauges, yet isn't new enough to use a bus(CAN, VAN, etc..). I.E. one that uses a voltage wave generated by the ignition system to drive the gauge directly.
I can't say this with 100% certainty, but the gauges you have look like they would use CAN bus. As such they cannot be driven by the Revburner or similar devices.
It's not so much a technical limitation as it is a lack of available information. CAN bus systems are only partially standardised, and the instructions they use are manufacturer or even vehicle specific.
They're not publicly documented, which makes emulating them nearly impossible.