Desertdog71, no offense, but AGI? So you’re a CFI & an MEI, why did you spend $80 on your AGI, it's basically worthless. Are you currently working on your CFII and if so, are you going to spend another $80 for your IGI? Save your money, you don't need them! As a CFI, CFII or MEI you can teach ground without it.

This is only an observational bit of advice, no offense. I taught Instrument, PPL and CRJ ground without them. (I was a CFI, CFII, MEI)