Is static line really needed on an altimeter in a rag and tube plane?

[M61A1]

I have recently got my Cheetah-XLS which is the BushCats older brother flying. I have a steam gauge ASI and a MGL panel and no Static line per say. It just vents in to the cabin. Both read within a very close tolerance. I wouldnt worry about it.[ATTACH type=full" alt="IMG_6526.jpeg]53871[/ATTACH][ATTACH type=full" alt="IMG_6645.jpeg]53872[/ATTACH]

Are both of them open directly to cabin pressure or does one have a dedicated static port elsewhere?