Not many people would like to put FPV on small glow aircraft due to noise and vibration....usually vibration factor, engine block interference, mechanical failure at long range and fuel monitoring issues, fail safe support on glow almost non supported with today autopilot hardware.
However its hard for me to put into words about which products and how it works because it will text huge text book for me to explain how it works but i did wrote documentation and schematics how my FPV plane setup works which you can visit few pages at my website which can give you ideas what hardware you wanted to add in to build an FPV aircraft of your choice, read the links below:
Schematics:
