I met a Mustang II flyer that has fuel/air ratio gauges for sale. The gauge has a sensor in the exhaust gas stream and a 2.125" panel mounted, 10 LED readout. He says that as you lean, the LEDs start lighting and that when 5 of then are lit the fuel/air ratio is correct.

The price of the whole kit is about $140.00

Contact information:

Universal Technology, LLC
Attn: Ross R. Barnett
864 Linden Way
Auburn Hills, MI  48326

Voice: 248-736-9600
 Web:  http://www.unitecLLC.com/

--
Lorn H. 'Feathers' Olsen, MAA, DynaComm, Corp.
248-478-4301, mailto:lorn@dynacomm.ws
LNC2, O-320-D1F, N31161, Y47, SE Michigan