I think I've mentioned it before, but I absolutely hate when a car or plane has a rats nest under the hood. It just looks sloppy. Probably silly, but I've spent an absolutely ridiculous amount of time with planning and trial fitting to try to make this as neat as possible. In some cases I undoubtedly could have done it differently, but by and large, I'm happy with how this is coming out. A few days ago I started fuel plumbing but discovered I don't have teh right fittings to go into the red cube, so I moved on to engine grounds. A while back, I had made main battery cables out of welding cable that B&C sells specifically for this purpose. When I was routing wiring to the main starter I got to looking at it again and realized that it's awg4. The refuel wire I already have intended to go from the start contractor to the starter is awg2. I don't think that a 12" run of #4 is the end of the world, but I had some extra milspec #2 so I went back and made main battery power and ground out of the same stuff. I them made the main engine around strap out of awg2 welding cable that I got from tractor supply. It goes from the engine block to a nut plate about 1/2 way up the r/h side of the firewall recess, which is one of the recommended locations per vans. coincidentally, I'm also using that same nut plate for an adel clamp thats holding the ground from the battery. I has some awe 4 welding cable as well, so for good measure I ran a secondary ground to the firewall side of my forrest of tabs. The weak link in this is that both grounds share a common bolt on the engine case, but as they mount on opposite sides of the mounting lug coming off the case, it's hard to see how they could both break ground at the same time unless something catastrophic happens. I may play around with this some more in the future, but as for now I think this is the final configuration. As of last night, I have completed the install on the manifold pressure an oil pressure plumbing and wiring, and the wiring to the oil tempo sensor as well. Rather than the firewall mounted manifold than vans sells, I chose to go with individual transducer mounts from showplanes. These are aluminum billet mounts that clamp onto the engine mount tubes and therefore give a lot of flexibility about how and where you install stuff. by doing it this way, I was able to shorten up both the plumbing and wiring runs to these transducers significantly. The M.P. and Oil transducers come with a plug in pigtail. If one fails it would be simple to replace so I just spliced the pigtail into the ships wire bundle with simple butt splices. The wires for the oil temp are integral to the unit so for that one I used knife connectors. I'm going to list all my plumbing numbers later, for future reference, but basically I mocked up everything with vinyl tube and then had everything fwf made by TS flightlines. The are all custom length for my particular routing, and all have integral firesleeve except the M.P. line. The oil pressure line is a #4 but there's not really any reason that the M.P. line has to be that big. I had it made as a #3 line with a #3 90* fitting on the cylinder end and a #4 straight fitting on the other. Starting with this combo, I came off the M.P. port on the #3 cylinder with a #3 45* angle, then into the 90* hose end. this allowed me to turn that hose back inboard and run it parallel to the cylinder head oil return line rather than having it just flop aft into empty space.