ah yeah, its not a grommet through the firewall. its a rubberized piece that is at the end of the fusible link that goes directly into the firewall through one of the three plugs with all the wiring. I will take a picture of what I am talking about.
if I do this do I just put it right there on top of the original wires that are hooked into the ammeter and its just an additional thing to clamp down with the nut?
thank you everyone for your help, i appreciate it. i've read through a ton of info about voltage drop and everything to try to figure this out on my own and was just really thrown off by what appears to be a brand new harness under the dash.