Is any one able to tell me if the line and fittings need two of the small barrel sleeves (one on each end)? My block fitting came with only one of these sleeves. If only one is needed what side does it go on (block or gauge)?
I believe you do need the "barrel" piece with the splits shown above, that slides up the tubing at both ends. That's where you get the compression. However, I've never had mine apart at the gauge. Check UPC U17 in the AIM, it might show that level of detail. If you only have one, check your gauge. Someone may have placed it inside the nut for safekeeping, and then screwed the nut back onto the nipple on the rear of the gauge.
this is one solid piece with no splits (tiny barrel sleeve in pic)