Squeeze I am trying to understand really I am but Im a work in progres,:). What do you mean by TF gauge (what is that). How do I know if it is sound? To simplify things and avoid any issues I bought a voltmeter, and want to disconnect the ammeter, Im assuming that is the "Amp" gauge on dash????? So I guess my question is if I do have an "amp" gauge how do I disconnect it and avoid issues and connect a voltmeter so I will not have to use a shunt and two be safer and more up to date on technology?