You need to hook a manual gauge onto the secondary side tank. I had issues with a gauge sticking on one for an SO here. It was building to correct pressure just showed wrong on the dash. I chased and chased air lines to try to find the issue. It was right in front of me.
Sure, ad-blocking software does a great job at blocking ads, but it also blocks useful features of our website like our supporting vendors. Their ads help keep Steel Soldiers going. Please consider disabling your ad blockers for the site. Thanks!