Hoses had to be black :) I don't get the obsession with blue hoses!
I don't have any indication that the fan is running, no. I'd thought about it, but for now I'm happy enough relying on the intermotor switch to do its job. They seem to be the one defacto manufacturer for these things so I'm happy enough trusting it.
I don't see any fluctuation in the gauge either, until my thermostat sticks open, which it seems to be doing again slightly. That and a leak on the top hose spout where it bolts to the inlet manifold getting progressively worse means I'll be draining coolant again in the near future and pulling the inlet manifolds off to replace the o-ring and thermostat.
I'm very happy with the performance of the fan, cowling and thermostat switch, however. I doubt I will ever need to use the overrride switch, as at 100c the thermostat switch will bring on the high speed anyway, but it's a handy fail safe, as it is wired to the fan's relay box directly bypassing the thermostat switch.
I should point out for anyone else considering this, I have bridged the single pressure switch that controls the low speed 'on' setting for the condenser fans. This means my front fans always run on low speed when the air conditioning is on. I've only done this for the air conditioning's benefit, as these fans do naff all for cooling the main radiator on a V8. In theory you shouldn't need to do this, as with no air flow while stationary and the engine cooling fan is off, the pressure in the condenser would build up and bring them on anyway. While testing the engine cooling fan, I actually had the condenser fans come on at high speed by themselves, meaning the pressure in the condenser had built up quite a bit beyond the slow speed stage. I can't remember the specs but it's not too bad, and they didn't run for long before going back to my forced low speed. It was a warm day, and the car was sitting with the sun directly overhead too, so inside was mighty warm. There is an 'oh Jesus Christ I'm about to pop' overpressure cut out on the compressor circuit too, which I think is set quite a bit higher than the high speed fan switch, so if it does go thermonuclear, it won't actually do damage.
This assumes of course your air conditioning and condenser fans work. The fans really need to if you're going to lose the viscous fan and want the a/c to work properly.
Just goes to show though, the viscous fan did move a lot of air even when mostly free-wheeling, and pulling air through is a lot more effective than pushing! I'm still happy to no longer have it though, as is my water pump. No more coolant emerging from the weep hole.