Since an update was requested....
Now that 01-386 is at the body shop and I have a solid plan for the underbody hardlines, I've started working on mapping out electrical to support a few items I'll be adding. I'm still working on documenting with diagrams but the plan is something like:
Oil temp sensor
Oil Pressure sensor
PLX Wideband sensor + controller (digital and Analog wideband to s300\analog narrowband to oem ecu)
RaceCapture Data acquisition system (CAN from s300\OBDII from OEM ecu, analog sensors, GPS Ant.)
Ecliptech ShiftP2+ (programmable shift light\warning light system)
Water\Meth inj. (Pump, solenoid, low level sensor, control signal)
Alpine PWE-S8 Subwoofer
OEM Siren (will need to make a harness since options harness is no longer avail.)
OEM Alarm (making my own door harness since kit I picked up only had main unit, attachment harness w/ relays, and mount) Diagram ->
https://i.imgur.com/MoHdyExh.jpg
To keep things clean with all the additional wiring I'm putting a Blue Sea 5/16" pass through post, that will connect 4AWG power feed run back to the hatch (+ sub and meth. inj. pump), and an 18 position Deutsch HD connector, for everything else
https://www.te.com/usa-en/product-HDP24-24-18SE.html on the firewall.
Since I'm running the LiFePO4 battery I have options for terminal connections. It's an M6 screw down terminal that comes with standard terminals attached. I also picked up m6 to 3/8" studs from Pegasus for a heavier duty option. But I'm thinking just using M6 might be the easiest since I already have m6 lugs in the equiv. of 4awg to 10awg, where its hard to find smaller dia. lugs that fit 3/8". I probably won't need to support smaller diameters at the battery though since I'm feeding a 4AWG to a 50 amp breaker so i can use the supply post on the breaker for distribution to smaller gauge if needed and it will also help keep battery connections a bit cleaner. Anyway everything will get boots and shrink tube, even the LiFePO4 battery will go in the OEM battery box with a custom cover for a clean\OEMish look. Connectors down stream will generally be Deutsch DT or MDT, where <20AWG is used.
Under the dash I'll bring an 10AWG constant power in to a small distribution post and to a relay for switched power for accessories.
A dedicated ground will also come in from the T-Stat housing for the wideband controller and RaceCapture to align with ECU signalling.
I think I should have most of the connectors, pins, sockets, seals, boots by early next week. I still need to find smaller 12-20 gauge wiring I like or I may gut wiring from the LS and spare 98 floor and cabin harnesses I bought so I can color code similar to OEM.
If anyone is doing the Mil-spec thing or otherwise adding one of the Deutsch size 24 bulkhead connectors, I bit the bullet and bought the D-Hole Punch and a cheap hydraulic crimper that will handle solid crimp on ends 2/0 to ~12 AWG. I'll share my experience with them and once I'm done if anyone needs to borrow the hole punch PM me.