I've used several methods but I stopped using the 42% Productsignition regulator and opted for a diode instead, lots less wire to mess with. On the last couple I've built (a 50cc MX2, a 100cc Yak 55m, and a 40% clipped wing Cub)I used the Rcexl optical switch, on the instruction sheet, if you use a magnifying glass you'll be able to read the instructions for a simple mod that will turn it into an IBEC. It doesn't regulate voltage though so you still need the diode, no need for the extra male/male extension to connect to the Rx. Range tests to over 150' with engine running at all RPMs with my Airtronics S10G. That set up will get over 150 flights this summer for test, so far abouta dozen flightsand not so much as a singleglitch.