I just hooked mine up and got the same results... I was really hoping to find the answer on here. Did you get any word back from them? I round mine to the OBD2 bracket like Tim mentioned, and I think all my ground wires are correct. I never calibrated it, but even while I was trying to it was just flashing 7.4.

Damn it I really wanted to have this squared away tonight!

 

Anyone ever get this figured out?

 

I know this is old but are there any updates to this?

 

You need to have the signal wire hooked up to the LED that will flash a certain pattern letting you know the problem it faces.

This will help lead you in the direction of the problem, from there its trial and error.

I had a hell of a time hooking mine up initially... ill be honest I was cursing this god damn thing. Now that I have it hooked up right I think it works awesome. Flawless for the past month and a half or so.