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Marv,

[Rotometer??  Can I assume (once again) that this is a type of flowmeter?
Who makes it and where did you get it?

This is an industrial flowmeter manuf by Brooks Instrument co.
I believe it is a sho-rate 50 with a 0-20 gpm scale.  It is a simple
glass tapered tube with a ball 'float' incased in a SS housing and 1/4
npt pipe fittings.  Mine came from Geo E Booth co in Indy, In.   I've had
it for years so a new Cat with current pricing from them would be in order.  

After being in a Mustang II and accidently running one wing tank dry with
a valve open to a full header tank and riding that bucking bronco for
what seemed forever, I chose not to try the crossover valve to level the
fuel in case of a pump failure.  My option is to find an airport within
the range of the header tank and fix the problem.  I admit I can still
have the above problem but I should be more aware of its upcoming
possibility.  Believe me, with 180 horses unexpectantly gasping for fuel
up front gets the juices flowing. <G> Reaching for the throttle or fuel
valve seemed to coincide with the surge of power that threw us back into
the seat and my behind-the-airplane stick inputs didn't help either.  We
still laugh about it today but at the time....    Earl