Is there an existing hole in the firewall to run a vacuum hose through for a boost gauge?? I found a grommet up top and I tried pushing a coat hanger through, but there is a wall behind it. Any help would be appreciated.

 

down at the bottom left is a large grommet - and it is split
I pushed it out - pull my wires thru the split in the grommet
real easy
It is where the main harness goes thru..
Hope it helps.

 

Driver's side??