Heli Hud Gauge Tweaking

ok guys, here's one for you... I download a HeliHud gauge (bg_helihud.gau - http://www.hovercontrol.com/cgi-bin/ifo ... =and --- the one on the left)
while I do like everything that this gauge shows.. there is only 1 thing that I do not. Ambiant Temperature. It is in Celcius and I only know and fly with Farenheight (I live in "The States"; we don't really use the metric system here)
in the XML for that gauge, the line that controls the Temperature readout is:
(A:ambient temperature, celsius) 9 <= if{ 0 (>L:EnvTempColour, enum) } els{ (A:ambient temperature, celsius) 28 >= if{ 2 (>L:EnvTempColour, enum) } els{ 1 (>L:EnvTempColour, enum) } }
How can I change this to Farenheight and it show properly? change the A:ambient temperature, celsius to A:ambient temperature, farenheight
while I do like everything that this gauge shows.. there is only 1 thing that I do not. Ambiant Temperature. It is in Celcius and I only know and fly with Farenheight (I live in "The States"; we don't really use the metric system here)
in the XML for that gauge, the line that controls the Temperature readout is:
How can I change this to Farenheight and it show properly? change the A:ambient temperature, celsius to A:ambient temperature, farenheight
