I'm still actively working on mine; hope interest has not faded, because I'm about ready to make some production commitments. Final designs are complete now. The design is 3,000 to 30,000, limited of course to the sender saturation point itself, which (as everyone should know) depends on the truck and is approximately 26,000 or 27,000 psi.
The gauge will be analog. Way cool for actually observing rail pressure while driving. not just for insights into maximum rail pressure, but to really study how the rail behaves under various conditions, with various boxes installed, downloaders, etc. I've been testing them all
Final sales availability channels are not yet in place, but since I have both the gauge design and the wiring harness finalized and suppliers identified, it should not be long. I've been runing with a final sample gauge in my truck now for 2 months and the performance is very satisfactory.
stay tuned; I can't give an availability date yet until I get supplier commitments.