Is/are there more than one source of input for the infamous "warning light
of doom" in the center of the water temp gauge?

I am under the impression that it is a single source of input -- that of the
coolant "float" in the main coolant tank.  If that's the case, mine needs
replacing, since it has gone into "flash--pull over now" mode without other
provocation twice in the past week.  I then religiously check the level of
coolant in the main and recovery tanks (both OK), and even check the
radiator bleed screw (no bubbles).  After I start up again, the light is gone.

If there is another source for the flashing light, it would be extremely
helpful to know it, so that I could trace it back...

As always, thanks in advance!

Mark Pinkstone
'85 Westy Wolfsburg Weekender (Gisela)
'94 Mustang GT Steeda Ragtop "Mid-life CrisisMobile" (Marilyn)