Parts

Here are parts in current and recent use.

Part Part Number Image Recent Source
Air charger unit, single output. PK-D12F www.aliexpress.com/item/32796346637.html
www.amazon.com/Purifier-Ionizer-Negative-Generator-Cleaner/dp/B07J4RZPTS
Drok DC voltage converter/regulator, wide range of input, 5 VDC output.
Note the waterproof packaging, rather nice for the engine environment. Drok and other makes also have similar units with screw-adjustable voltage output.
www.amazon.com/dp/B00C63TLCC?psc=1&ref=ppx_yo2_dt_b_product_details
Fuse tap for any size fuse.
Many on the market are rated at 10A max, which limits which OEM fuse socket you can safely use.
Car Add-A-Circuit www.walmart.com/ip/Car-Add-A-Circuit-10A-15A-20A-30A-ATM-APM-Style-Fuse-Holder-Tap/746325304
3M Dual Lock fastening material.
I laid a small bed of this in the air filter compartment, then cut sections to size to hold each item.
www.homedepot.com/p/3M-Scotch-1-in-x-10-ft-Clear-Extreme-Fasteners-1-Pack-RF6760/204465393
Lever-nuts.
These things are great. They keep wires very securely connected, protected enough, and nicely removable too. They come in lots of shapes and sizes. This is the kind I’m using so far. The link is to a two-conductor version. One can buy an assortment at astonishingly low prices. The only catch is, you’ll need to put them where rain doesn’t go.
www.amazon.com/Wago-222-412-LEVER-NUTS-Conductor-Connectors
Temperature-controlled switch.
This is an excellent component of standard part number, made by quite a few different manufacturers in different locations, and the prices have been going down, not up.
XH-W3001 www.amazon.com/gp/product/B08QZ5VRYC