Greetings John, Thanks for posting the schematic. At first I thought it wouldn't work for me but I just now realized that the first pulse could be the non-welding pulse. The reason for the pulsing is to avoid warping of the metal and a welding pulse twice as long would put too much heat into the work. But if I use the first pulse as the off weld pulse it just means a slight delay every time I pull the trigger. In fact, since I want the gas to flow constantly the extra long pulse at the beginning of welding will insure there is pure gas flowing when the first weld starts. I will be connecting the switch in the MIG gun handle to both the timer and and the gas solenoid controller. I'll let you know how it works. Thanks again, Eric