I'm planning to replace these toward the end of season and by searching around figured it either require partial sterndrive disassemble or some people tend to drill hole above the waterline and put wires through it. I have an idea to cut the wires of old sender solder new sender wires on them really nice and put heat shrink over, then slowly pull from the bilge until new cable is inside then cut, crimp new connectors and that's it. My only concern is to cut some seal inside with the soldered boat and get a leak. Not entirely sure where they are routed exactly. Assuming you can pull/push current wires without resistance nice solder job with quality shrink shouldn't make a difference. Have anyone tried this method?