ORIGINAL: CGRetired
You know, the way these iPhones, Droids, and so on, you can pretty much bet on there being an App that will work as a tach. The phone is just an afterthought.... ''oh my, we should build a phone into this thing.. ''

CGr.
If there isn't....brb writing tach app for Droid...[8D]
lol but in all seriousness I'm surprised there's no iOS/Android tach app. There's apps for gearing calculators, apps for forward speed, apps for orientation, apps for measurement, apps for conversion, apps to tell you the weather and wind speed in your area, there's even a speedo that uses the doppler effect written specifically for RCers available for iPhone.
My Droid is 100% part of my pit box...