Eric -
Yes, I'm aware of the heat shrink tubing with low temperature alloy solder inside. (It's similar to some copper plumbing fittings now available.) However, not all have the epoxy adhesive that seals the heat shrink tubing to the wire insulation. (The epoxy adhesive seals the connection against air and moisture that can lead to corrosion.)
The picture in the eBay link you posted had a "R. Ehrenberg" copyright overmark. I assume this means Richard Ehrenberg. If so, I'm inclined to trust this product.
Richard Ehrenberg is a long-time, very knowledgeable Mopar expert, who has written extensively on Mopar electrical and electronic systems. I've learned a lot from what he's written and trust anything and everything he's involved in.
I've actually contributed to one of his online articles --
https://www.allpar.com/history/mopar/electrical2.html -- which describes a mod Leeann (among others) has made to have both an oil pressure gauge and warning ('idiot') light.
TreeSeeker -
The eBay link you provided (naturally) only includes favorable reviews. I'd search for other -- independent -- reviews before buying.
Based on sometimes painful experience, I'm wary of anything 'innovative' until it's proven through (other people's) experience. There's far fewer people available to help you 'once you go off the beaten path.'
I've been considering, for a long time, changing the v-belts on my engine to a serpentine belt system. One concern that's holding me back is availability of parts and technical assistance for maintenance and repair.
BTW - the ICM in the link you provided doesn't have the visible large power transistor ... but it most assuredly has internal transistors. (The use of semiconductors -- diodes and transistors -- is one thing that separates 'electronic' from 'electrical.')
