You don't have to give up your tank gauge
View attachment 325022 You'll need to remove the OEM fill nipple and replace it with a right angle tee adapter. I use this one from Mcmaster:
McMaster-Carr is the complete source for your plant with over 595,000 products. 98% of products ordered ship from stock and deliver same or next day.
www.mcmaster.com
Assemble like this (You'll reuse the gauge you removed for your Huma:
View attachment 325024 You'll also want to replace the OEM fill nipple with one that has a self contained check valve. This is the OEM:
View attachment 325026 You' want one like at the below link as there is no longer a back stop for the OEM check valve when using the tee adapter:
High quality Stainless Steel male quick-disconnect fitting with removable check valve that will only allow air to enter through the quick-connect fitting.
airtanksplus.com
(I also found some cheaper ones one ebay)
It sucks not being able to monitor the PSI in the tube. This is great solution that has worked perfect for me.