the dog posted a topic in G4+I am trying to connect a monsoon ecu to work as piggyback on an s2000 ap1. I am trying to retained all factory options like tacho, engine temps etc. I am having big issues connecting it. As soon as I connect parallel one senosr (like the trigger or temp) I get ground loops with my water temp and air temp reading jumping all over the place. I also get trigger errors. Any idea how to connect it and make it work?