Lynn, I will need an aluminum troth to lay the wires in under the fuel tank.  Is there any issue about running the wires through thru the SS fire wall?  Thankyou  JohnD

I would run them through some soft aluminum tubing. Install a collar and B nut on the tube and go through the stainless with a bulkhead fitting. (A good name, yes)?

 

If the wire run will stop there, remove the engine side of the fitting and flair the hole on the lathe or with a die grinder to avoid damage to the wires. Fill in around the wire at the firewall side so fumes or worse cannot get into the cabin. Just a bit of silicone is fine.

 

Lynn E. Hanover