Quote »Auto Timer Mode automatically calculates a suggested count down timefor your vehicle, according to your car’s RPM. You may also choose 2 count down time offset ratios "Hi" or "Lo". This will add a preset time to your calculated count down time.On some vehicles, there is a possibility that the Auto Mode will not function properly due to difference in usable rpm range. The Turbo Timer begins calculating, when your RPM reaches approximately 3000 RPM for "LO" mode and 2000 RPM for "HI" mode. A minimum value can be set from 0 sec. to 1 min 30 sec. by increments of 10 sec. The factory setting is 0 sec.[/quote]from the greddy manual.
Just so you know, even with the harness, you still have to do some wiring.
There's 2 more wires you HAVE to wire up, and 1 optional.
The first one is the ground wire(no ground...no worky), the second is the parking brake safety. If this wire isn't connected to your parking brake light, then the unit will not function.
It's a safety feature, so that if the turbo timer is in use, and the parking brake is released, it will shut off, and the engine will shut off as well.
The last is the optional speed sensor wire. This is so you can use automatic mode.
Here's the greddy manual, it can do lots more.
http://www.greddy.com/img/PHP/products/pdf/685.pdf