So,I decided to try this

I would seriously consider redoing what you have done there. For a few reasons

1...Hard to tell looks like a poor solder joint or two. maybe

2...It appears you soldered to the IVR socket terminals. Those have a bad habit of 'not' being in contact with the board traces. Consider scraping the board trace and soldering to that

3...The biggest concern I have, is the very large and very unsupported wire. That "may" rattle around with use, and it's own weight and inertia, and break loose and cause a short or other problem. Consider re-working with smaller wire. A good cheap source of wire is a scrap length of something like CAT-5 cable.

4...One way to support all that.......regardless of weight and size, is to glue it down with something like GOOP. Yes, that is a brand name, LOL. Any hardware store has it.

Also.......on a side note, I hope you installed a ground pigtail

Re-worked the cluster connector pins

and loosened / tightened the gauge stud nuts.