Although on a gxcs4i i went with an amazon and hardwired to motor leads i also wired in dual water temp sensors one on pump head one on water tank guages are mounted on a piece of formed kydex and inline filter mounted behind guages
+1 for the wireless digital stick on (vibration activated) hour meter. I have the one shown in the pictures attached to my Yong Heng and it seems to be working fine. I have the sensitivity set to Hi. I installed it in 2018 and it is still working (not that many hours on the Yong Heng though). I don't think anyone sells this actual brand anymore, but there are numerous variations of it available on ebay or amazon.