I had no room under my dash for my ECU. It's got 3 big plugs and about 80 wires running to it. The only picture that I took was during mock up. It's mounted on the trans tunnel, a little further up than in the picture. I bonded a board to the tunnel and attached the ECU with 4 screws and some small rubber vibration isolators. About 20 plugs have to be fed through the firewall, so I have a 1-1/2 inch hole for each side of the engine, aligned with the valley , at the base of each cylinder head.

The fuse box shown is only for the engine and trans. There's another in the trunk for all other wiring. I routed wiring to the headlights through a very low spot, below the foot well, but if I got inside the frame, I'll have to drill a hole to do that. My taillight wiring and all other wiring from the trunk mounted fuse box run along the drive shaft tunnel, inside a console.

'37 Oze build