Using the Quality theory of passively reject/actively accept, your annunciators/lights should be set to light Green and Good. That way if you have a failure of the system that light goes dark and it should get your attention. It's better to respond to a false failure (burned out bulb/shorted sensor) than not be aware of a failure.
Mark W N952MW -----Original Message----- Matt Elder wrote: What ever happened to looking at the switch? Don't make this complicated. Also, it might not be a good idea to have a warning indicator for fuel transfer. 1) you will train yourself to listen for it, then it will fail on day and the fuel might not be the first thing you check because of desensitization. 2) after you forget the transfer it once (with no warning system), you wont again for a very long time.
