Ok, Ive got a magnacahrger on my 05 gto, and with the kit was a magnavolt, which is pretty much a boost-a-pump unit. It gives the fuel pump about 17 volts when boost >3psi. and rpm >4000. Anyways, I want to be able to log the voltage going to the fuel pump, but I know the inputs on the E I/O are only 0-5v. Can anyone help me out on how I can reduce the voltage so for example at 18v, I will get a 5v output. I just want to be able to know when the booster kicks in.