Glade Hal Meter Spindle Speed -> postgui

Hello,
iḿ still a beginner with glade and today i wanted to add a Hal Meter in Glade that shows the spindle speed. 
Things i did so far:
- I found out that i minimum require a float signal (maybe that on the picture attached?)
- i created a Hal Meter in Glade -> see attached file

I tried to add the call for gladevcp.Spindel in my machine.ini but didn't realize that Glade starts after the machine.ini

My next step was the postgui.hal
net Spindelrpm =>  gladevcp.Spindel <= spindle.0.speed-out
Error --> custom_postgui.hal:9: Pin 'spindle.0.speed-out' was already linked to signal 'spindle-vel-cmd-rpm'

Yesterday i learned that if a signal is linked i can´t use it.... but from here i don´t know further

Please help
 

Unfortunately, I'm still stuck, even with the additional link.
My thoughts:
Where can I get the spindle speed (float)? Would that be the value “spindle.0.speed-out,” for example, which can be seen in the attachment?
How do I transfer the float value to gladevcp.Spindel?

My favorite code doesn't work. Error "custom_postgui.hal:9: Pin 'spindle.0.speed-out' was already linked to signal 'spindle.0.speed-out'"
 

net Spindelrpm => gladevcp.Spindel
Got that... i just created the signal.name Spindel.rpm which is linked to gladevcp.Spindel.
There is still my problem where to get the float.out(?) from and link it to Spindel.rpm. My "favorite" spindle.0.speed-out is already linked -> Error "custom_postgui.hal:9: Pin 'spindle.0.speed-out' was already linked to signal 'spindle.0.speed-out'"

Sorry... German beginner