If you are somewhat proficient in electronics, you may be interested in building the "Electronic On-Board Glow Driver" designed by Stan Evans and was featured in "RCM, January 2002". A friend and I built and installed this design in several planes and every one works flawlessly. The nice feature is that the driver is independent of receiver controls, such as throttle. It is designed to operate on the temperature of the glow plug, not the position of the throttle servo. In many cases, when the throttle is suddenly advanced, most glow drivers will turn off when they are needed the most. This driver will remain on until the glow plug temperature increases to the preset level.

Please advise if you are interested and need more information. It's been more than 10 years, but I still have the article from RCM.

DaveB