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Yes, you really should have a gauge. Easy with manifolded doubles, open the isolator and put the gauge on the other tank.
You may also wish to consider a whip that has DIN on one end and yoke on the other. With this rig you lose being able to transfill two 300 BAR DIN cylinders, but you gain the ability to fill "yoke only" cylinders. Just add the insert to your DIN valve so the yoke works, then remove it after the transfill. This is what I use.
You may also wish to consider a whip that has DIN on one end and yoke on the other. With this rig you lose being able to transfill two 300 BAR DIN cylinders, but you gain the ability to fill "yoke only" cylinders. Just add the insert to your DIN valve so the yoke works, then remove it after the transfill. This is what I use.