I have a polarstart with the diesel interface it waits for your glow plugs so it knows when they have cycled, it also has turbo mode to idle your truck before shutdown to slow cool your turbo and its two-way but i wouldnt recommend this one as the brain has failed the two way remote has failed and shock sensor has failed. Its been fine now since every thing is brand new since april maybe i just got a friday one. My buddy has a compustart on his f-350 thats two yrs old and been perfect