Sthis

I just finished installing my V-AFC and I have a problem with it. I am sure all the wires are connected right but the RPM reading is off, for example if it was 3000 RPM it will show 2500 on the V-AFC?? My other question will it hurt the car if I drove it with the V-AFC until I get it toned like in one week or so?
Will the V-AFC give more power since I have comptech fuel pump and AEM FR?

Injen intake, DC headers, Spoon exhaust.

Thanks