please house, i am building a CESSNA aircraft with a friend,it's features are 2 sitters,54 liters on fuel (PMS), 22ft of total length from nose to tail, 20 ft of cross wing length,powered with 3 OHV engine 2 (5.5hp) on the wings with 1 (11.5hp)on the nose all are propeller/fan engine. well we've gone far long with it but i have a challenge on building air speedometer,altimeter and airport Transceiver.. please i will appreciate a big help on this three thing thanks.....from blessed king on Facebook..princekingsley2009@yahoo.com