fuel..

hi i want to tune my b16a itb i know to calibrate the fuel and now i want to calibrate the ignition so cause the car is drag i want to use this device :http://www.ebay.com/itm/110701853547...S:1123&vxp=mtr
to see if and when i have detonation to adjust proper with my s300 are you agree with this device ?my car is :
civic sir eg6 92-95 as i know i do not have wiring for knock sensor i am running a edm p30 so i must plug a wire in to mu ecu pin that is for knock sensor and sent it to my engine block and conect it to a knock sensor to work this device thanks a lot
the seller says that this device has 95% accuracy