I'm attempting to design a Graphic Engine Monitor gauge. One of the features is a trend indicator light that displays whether the EGT is increasing or decreasing. I tried the following without success. Line 3 -- I hoped that, every update cycle, it would store the variable "EGT" as a variable called "Old", then take the current Eng1 exhaust gas temperature and store it as the variable "EGT". By comparing "EGT" to "OLD", I could tell if the temperature was increasing or decreasing. Unfortunately, this code is so broken that "EGT" and "Old" never appear to be anything other than the default value of zero. Help with this code? Or, can anyone suggest another way to keep track of changes in the exhaust gas temperature? Thanks in advance. ((L:EGT,number) (>L:Old,number)) ((A:Eng1 exhaust gas temperature,farenheit) (>L:EGT,number)) (L:Old,number) (L:EGT,number) < (L:Old,number) (L:EGT,number) >

Hi,Too many parenthesis here: ((L:EGT,number) (>L:Old,number)) ((A:Eng1 exhaust gastemperature,farenheit) (>L:EGT,number)) Just make it (L:EGT,number) (>L:Old,number) (A:Eng1 exhaust gastemperature,farenheit) (>L:EGT,number)Hope this helpsTom

Thanks, Tom. It works now. xml syntax is still a little tricky to me.