It only sees 16V for a split second when the MSD sends it. I don't think you will have any issue. I actually think you could have the 16V sitting there and supply ground as well. The MSD 7AL-3's rpm activated switch supplies ground. I think you could run it either way (normally open or closed) with the digital. The solenoid sees voltage for only a millisecond either way. Mine runs off my Biondo Mega 400. I have everything fused as per their instructions. Just follow the MSD instructions as they are very good and simple.