I wonder if there's a market for a company that makes affordable custom short extension or Y-splitter wire bundles, using 3D printing to cover all the innumerable automotive and appliance plugs and sockets that exist out there.

It'd make it a lot easier to cleanly (and reversibly) tap some CAN bus cables, for example.

I left my telematics unit in place, but disconnected its GPS and cellular data antenna plugs.