Aha! I read the manual but couldn't figure out that it was designed to be grounded together with the injector by the ECU. For some reason I understood it like the ut-comp was expecting a 12v signal when the injector was opening. So I assume the utcomp is designed with a high impedance output to the ...

Hi! I am researching trying to figure out if I should buy the UT-comp pro and associated sensors or not. I have a Subaru impreza wrx sti 2008. It's a family mobile and a street car so any modifications have to retain original functionality to 110 percent. The ECU is very programmable and support eve...