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need help writing code for fuel guage.......SENDING DATA TO NEXTION

I have the  sketch below , the sketch is reading on  arduino serial monitor.I m using arduino mega and 7" nextion.Im in pin (tx2) 16 and (rx2 )17.I have read instuctions but must be missing something. thanks 

ino
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Please review the CompGauge example in this thread.

http://support.iteadstudio.com/support/discussions/topics/11000009208

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