running my extcy with qev and techt L7 bolt at 15 dwell. to set dwell do the following: 1) make sure the marker is not in locked tourney mode, do this by holding down the trigger and connecting the battery to the connectors momentarily. a green light should blink once for unlocked mode and if the light blinks red the board has now been locked. Repeat the above method if necessary to unlock. 2) while the battery is connected, hold down the tiggar and turn on the marker. 3) the marker should blink the color indication for the strength of battery remaining and then remain solid red, you are now in programming mode and at the Rate of Fire setting, pull the trigger once and the LED should turn solid Amber, you are now at the dwell setting for the marker. 4) hold the trigger down for about 1.5 seconds until the LED goes dark, once unlit, release the trigger and pull the trigger again for the respective number of miliseconds you wish the valve to remain open, so for example if you want a dwell set at 27, pull and release the trigger 27 times in succession at a moderate pace. 5) after doing this the LED should blink in response the same number of times you have pulled the trigger, in this case the LED will blink 27 times. Count the trigger pulls and blinks to confirm the setting, after the LED blinks it will again turn solid Amber indicating that the board has now accepted this change to the dwell. 6) turn off the marker by holding the LED button down for about 2.5 seconds. 7) The new dwell setting has been saved to the board, to play with the new setting, simply turn on the marker and go!