Still dont see what the reason is as to why the stock gauge wont work hooked up to the negative side of the coil.. as for the needing a tach adapter to plug into the msd tach output and read accurate i dont see why considering on msd’s site they say you need the adapter if you have a multiple coil application which i dont so?? Id love to actually have some actual information as to why it doesnt work. Is it because its a 4cyl tach or because i need a tach adapter and why? And does this mean even with a v8 cluster id still need an adapter? Id think i could have gotten a definitive answer on this by now from one of you guys