Hello Gmauer,
I have a Blue Sea panel meter in good shape that I removed (replaced with a digital battery monitor) from an O'Day 25 that I just sold. Now I can concentrate on my E30+ !
I think it is the same size as the one on the E30+ panel, I will post a picture and cite dimensions later,
I can send the meter to you if it fits. I'm planning something else for Freeform.
Graham