This may not be the place to ask, if not, please direct me to a forum to ask.

I am trying to make a wifi icon (standard dot and three bars type of thing) with geektools. It will have two identical symbols, one grey constant, and a black one that grows depending on connection. (Like the CPU and Memory you can see here)

My question is to any of you with far superior knowlege than me, how do I do this?
Here is the script for the black bar if it is of any help.

SYSTEM=`top -l3 | grep "CPU usage" | tail -1 | awk '{print "X"int(($3+$5)/2)"X"}' | sed 's/\%//'`

echo $SYSTEM | sed "s/X0X/a/;s/X1X/b/;s/X2X/c/;s/X3X/d/;s/X4X/e/;s/X5X/f/;s/X6X/g/;s/X7X/h/;s/X8X/i/;s/X9X/j/;s/X10X/k/;s/X11X/l/;s/X12X/m/;s/X13X/n/;s/X14X/o/;s/X15X/p/;s/X16X/q/;s/X17X/r/;s/X18X/s/;s/X19X/t/;s/X20X/u/;s/X21X/v/;s/X22X/w/;s/X23X/x/;s/X24X/y/;s/X25X/z/;s/X26X/A/;s/X27X/B/;s/X28X/C/;s/X29X/D/;s/X30X/E/;s/X31X/F/;s/X32X/G/;s/X33X/H/;s/X34X/I/;s/X35X/J/;s/X36X/K/;s/X37X/L/;s/X38X/M/;s/X39X/N/;s/X40X/O/;s/X41X/P/;s/X42X/Q/;s/X43X/R/;s/X44X/S/;s/X45X/T/;s/X46X/U/;s/X47X/V/;s/X48X/W/;s/X49X/X/;s/X50X/Y/"