that means it shows ur engine is on load which is sucking more air then normal to keep the rev's up . cause if im idling without the a/c on , it will be at -0.3 if i on the a/c it goes up to -0.5 cause of the isc valve is open so that more air can be sucked in , if i on the lights and if the radiator fan kicks in it goes up to -0.6 also cause of the isc is sucking more air to keep the engine rev at the preset point that you had adjust at the base idle set screw . so if yours is at -0.8 must be on high load i assume .
anyway please check your junk mail , cause the activation form is aready emailed to your email , cause we have a carbon copy of the activation form to our private email's , so i don't see why you are not getting it .