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Message: <blockquote data-quote="shovel" data-source="post: 1588590" data-attributes="member: 29855">I'm still waiting for the Sniper 2 to come back from Holley (they received it yesterday and today it's the weekend);  but I have a few minutes and I'm thinking about it so here's something else that may be helpful to someone in the future. The Sniper 2 has two GPO channels, that means in addition to being able to trigger a cooling fan to turn on from coolant temperature or A/C operation you can also use some logic to trigger a second thing.   That can be a shift light,  a nitrous window,  high rpm/WOT air conditioner disable, second cooling fan, etc - in my case none of those things are applicable so I'm going to assign it as a check engine light.  Our check engine light is supplied with constant 12v while the key is on, and then gets illuminated by the ECU by connecting it to ground.    The GPO channel on the Sniper 2 is also a selectable ground and has sufficient current capacity for a little light bulb so that means I can directly drive the CEL with the Sniper.   It's not possible to make those assignments with the phone app or the little control screen,  so it requires a laptop and their expensive-a55 USB cable.  In case anyone is wondering why I would want to enable the check engine light, it's because I do not want to have extra screens in the car.   I have to look at pixels all day at work, I have to look at pixels if I want to talk to anyone, I'm looking at dang pixels right now..   pixels are fine but sometimes I want to not look at pixels.    So the gauge cluster is remaining fully functional and along with that I'm enabling the check engine light. There's a limit to what can be used from the TBI,  it allows up to 3 conditions to be set.   Some of them might be a little redundant like I can set high temperature warning but keep in mind that the gauge cluster and the EFI use two independent temperature senders so it's plausible for the water temp gauge to fail and the TBI water temp sender to remain functional.   So I'll use some arbitrarily high water temp (250F? ) as one of the triggers,  maybe a fuel trim wayyy out of range as another trigger (indicating major vacuum leak or fuel pressure problem, for example) and maybe something like manifold air temp too high or engine stalled as another trigger.     It's possible to use logic like no oil pressure + RPM over 0,  but the TBI natively doesn't have any knowledge of oil pressure and there's an oil pressure "gauge" of sorts already, as well as a low oil indicator separately on the gauge cluster so I don't know if adding that to CEL matters.  I'll edit this post later when I have actually implemented it - for now just sharing what's in the works.</blockquote>