You seem to be answering a statement I haven't made, Attabeach.
The
OEM gauge uses a short cable that attaches to the coolant temperature sensor at the pump, runs up through the channel under the Hall sensor cover and heads upstairs to connect with the gauge harness. You don't have that harness because your Brick is a C model. frankenduck makes this clear in the link I supplied.
By whichever means you connect that sensor to the gauge, the Hall sensor route that starts though the wire channel beneath the pump seems the most protected from road grit; however it isn't the only route.
I'm baffle by your reference to the float. The only thing it has to do with this is that, along with a coolant temperature gauge, you don't have one of those either.
Personally, I consider that gauge more of a
worrying gauge than a warning gauge. The temperature lamp suits my simpleminded approach to moto enjoyment.
