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How do i pipe data to gnuplot/no-fifo and plot the data on the fly

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my output is

42.0 27.8 29.8 43.0 42.0 43.0 
42.0 27.8 29.8 43.0 42.0 43.0

while true; do 
   sensors|egrep -o ' \+[0-9]{2}\.[0-9]+°C '|tr -d ' +°C'|tr -s '\n' ' ';
   echo; sleep 1; 
done|gnuplot -p -e '
  set xrange [0:60]; 
  set yrange [20:80]; 
  while (1) { 
    plot "-" using 1:2, "" using 1:3; pause 1; reread; 
  }'

just blocks. 
while true; do sensors|egrep -o ' \+[0-9]{2}\.[0-9]+°C '|tr -d ' +°C'|tr -
s '\n' ' '; echo; sleep 1; done|gnuplot -p -e 'plot "-" using 1:2, "" 
using 1:3'

So I tried
echo 20 40 60|gnuplot -p -e 'set xrange [0:60]; set yrange [20:80]; plot 
"-" using 1:2, "" using 1:3'
> line 1: warning: Skipping data file with no valid points

why is that?

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How do i pipe data to gnuplot/no-fifo and plot the data on the fly Veek M <veek@dont-use-this.com> - 2020-02-16 02:18 +0000
  Re: How do i pipe data to gnuplot/no-fifo and plot the data on the fly Gavin Buxton <gavinbuxton@gmail.com> - 2020-02-16 05:59 -0800
  Re: How do i pipe data to gnuplot/no-fifo and plot the data on the fly Veek M <veek@dont-use-this.com> - 2020-02-18 14:42 +0000

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