When I installed the ABA in my A’wagen, I felt that I had to add better monitoring since I knew that the inline motor runs higher pressures than the wasserboxer.  I bought a set of Cabriolet gauges and installed them in pods on the 'a' pillar.  The Rabbit OP gauge is 5 bar and always ran pegged.  I’ve been searching for a 10 bar gauge for a while that didn’t cost the Moon.  A few weeks ago I stumbled across these: https://www.ebay.com/itm/202121823405 which I replaced the VDOs with yesterday.  They seem to work just fine.  $26 delivered is about a quarter the price of a VDO 10 bar gauge and sender.  

So if you’re looking to add a couple gauges, this is an inexpensive solution.

Delivery was about a week.

Jim