Metering with Klanghelm's VUMT

Hello,
 
I'm starting to use Klanghelm's VUMT for metering, in addition to Sonar's built-in meters.  Sonar's meters are fixed at 0dB at the top end of the scale, and they "go into the red" at -6dB.  If I want to mimic Sonar's with the VUMT, do I set the VUMT reference level to -6, regardless of whether it's in VU or PPM mode?
 
Thank you,
 
Todd