lock up switch and sled pulling
 

Got the local pulls coming up on the 13th, and I read that some guys are running a lock up switch. Any opinions on this, and at what point are you guys engaging it, right off the bat, when it shifts to 2nd, etc? Im pulling with the 03 in my sig.

I should note that I run the smarty on lvl 9, fuel press. high, timing 2, torque 4, shifter in drive, and hammer down after 10lbs boost.