I did the exact thing you are looking to do.
Perhaps you've already fitted something.
I have a 1999 130hp v4. Carburated. Still with VRO.
I too did not trust the normally open circuits on the factory fitted over temperature switches. Due to broken or accidentally disconnected wire rendering...
Hi Faztbullet,
Thank for your post.
I take it you are the same faztbullet as on marine engine forum?
Pasting my response on there...
I double checked the doc I read that info on.
Its actually the installation instructions, which has a troubleshooting section.
Seems there are two of these...