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Don't know about the Ultraguage, but shutting off the engine without the key switch can be done with a switch inline with the power or ground wire to the injectors, making your own DFCO(Deceleration Fuel Cut Off). I did read somewhere on here that it might be a good idea to switch off the fuel pump as well( and that does happen when the keyswitch is used), but I don't remember where I read it. I'm thinking that is the direction I'm going to take.
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