OK, so here's where I'm at right now... I'm building these for just the cost of the components... No source code / sketch will be included... availible in either single or twin units, (including odd fire)... these are wasted spark, I choose to go this route for obvious reasons, not everyone can make the modifications needed to add the additional hall sensor... I still need to come up with a cost, they will be built on a per order bases... if it fails for any reason other than tampering, I'll replace it at no cost... I have one sitting here on the bench performing a durability test that's been operating for several weeks with no issues... I'll let you guys know more when I get everything all sorted out.