I thought I laid it out pretty clearly. Guess not. No, I would use something larger than -6 to connect the 2 regulators. If the ports you're connecting are -10 orb, then that's the size I'd use. I've never had any of those BG regulators (always heard they were junk), so I don't know what size the ports are.
I'd rather see -6 lines to the solenoids (the industry standard), but -4 may be fine.
CHIP
'70 hemicuda, 575" Hemi, 727, Dana 60
'69 road runner, 440-6, 18 spline 4 speed, Dana 60
'71 Demon, 340, low gear 904, 8.75
'73 Chrysler New Yorker, 440, 727, 8.75
'90 Chevy 454SS Silverado, 476" BBC, TH400, 14 bolt
'06 GMC 2500HD LBZ Duramax
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