Nah mate I think a digital tester wld be a bit flash for anyone from rocky lol jks jks but from wat ratter has said I think.he finds that the test tube reads a bit higher to his fuel thingy majigy on his dyno. My car was tuned on united 85 but my tuner left a heap head room to run eflex aswell. Found the car felt a bit stronger on united compared to eflex when I ran it though.