While the specs do say it'll run from 1.2 volts, are you sure 2 AA batteries in parallel are gonna be able to deliver enough current to light two glowplugs?

From Sullivan's website;

"Onboard Glow Plug Driver. This glow driver features your choice of quick and easy one button set point programming or automatic operation.

The plug received power at any throttle settings. The set point is stored in memory until changed. The green LED light indicates burned out plugs by flashing on the panel. The unit doesn’t require a Y-Harness, just plug to receiver, throttle servo and to any 1.2V to 12V battery. Only weighs 34g."



I use "ElectroDynamics" on board glow drivers and they use much bigger cells, "C" sized VS AA, that as an added bonus come prewired for charging.....
(this pic is the battery/wiring kit only, the unit itself is a small black box)