I was running a Wolf3D V4. I just used an aux output to swith a relay and programmed the output accordingly. I had to build an external circuit for the switch off delay though.

Throttle switching was as simple as:
AUX1 on over 55% TPS
AUX1 off under 50% TPS

More info here:
About 10 posts down there's a link to the delay circuit.