There is quite a controversy over those open element IAT's. Many will tell you they read inaccurate when the meth/washer fluid/or whatever you're using hits them if it's not atomized. I personally believe that to be some BS and believe that the numbers provided are accurate. I guess my point is that someone somewhere will tell you your numbers from that sensor are BS - it won't be me though.
It will read ultra quick from my experience. We can drop 140 degree IAT's to 85 at 20 gallons per hour in less than 2 seconds. I did over due it a couple of times though and added too much too quickly on the Cutlass. Also, if you're running pump gas, then do yourself a favor and get a consistent meth blend. Washer fluid will not cut it for consistency. I damaged the motor using washer fluid of varying percentages of methanol. Since then we've used nothing other than the Snow Performance stuff that is 50/50. The 50 percent methanol will burn and cool. Dropping it out will cause a lean condition (I promise unfortuantely).
Good luck and cant wait to see some results from this thing.