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The plain scotchloks I never liked. But the sealed ones that you have pictured above look pretty good!
I've used thousands of those over the last 12 years, and I don't know of any that have failed after the first confirmed good crimp. I've made bad crimps here and there, but the fix is fast with no need to strip the wire. I've even used those on my buried automatic sprinkler control wire.
I use crimp and solder, and your suggestion would work great for critical things like engine wiring. As for my gauges and many other applications, the sealed 3M™ Scotchlok™ have never failed me over many years of use.
Very easy to use, they are filled with a sealant that oozes out when you crimp, you don't need to strip the wire or use a heat gun, and you can see through them to ensure a proper crimp. I use the larger ones for all my trailer wiring, and I've never had a failure in that harsh environment.
That's actually a pretty good idea that I didn't think of. We always have a box of them in the work van for those times we get coerced into fixing a phone line.
Take a look at two top left. ICP readings. This is from Forscan. After recently installing ICP sensor, here are the readings. Just making sure they're normal. Truck starts fine but reading goes from 5?? to 377 while idling.
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