I use a set of regular gauges and all of the wires run and op line run through a 3/4 ish hole in my firewall. I have a cut up pcv gromet that I use to keep the edges from damaging the lines. My 2009 rulebook says that all holes have to be sealed, and the gromet doesn't seal it. What would qualify as sealing the hole? If I used high temp RTV to seal fill the open area would that be safe?