Installing a Faria Temp gauge on a 2002 90hp Johnson. Directions say to install sender under highest head bolt, rather not pull a head bolt if i don't have to. There is a hole drilled and tapped into each head. Is this hole for the installation of a temp sender, cant imagine what other use it could have. If it is OK to use this hole for the sender, does anyone know what thread it is tapped? Nothing i have threads into it.
