I've got a Glowshift Blue Digital Boost Gauge on sale here, it reads from -15 inHg to 45 psi
Blue Digital Boost Gauge
It doesn't have that little circle on the bottom right though.
Basically the Electronic sensor unit is USED, has been for around 2-3 months. The boost gauge itself is BRAND NEW, as I had to send in my old unit for repairs and got a brand new one back, complete with protective plastic over the glass.
Comes with gauge, sender unit, brand new tubing, and a used T fitting.
I've had no problems with this gauge whatsoever except for when part of the LED reading stopped working, but this brand new unit is working fine save for one problem I've noticed - when the car is "on" but engine isn't, the gauge should read 0 but it's keep going from 0 to -1 repeatedly. This doesn't seem to have any effect on actual use while the engine is on though.
So, 1/2 used 1/2 new, looking for
$30 picked up as I got a different boost gauge while waiting for this one to get back to me. Great tool to both see correct boost with the KWSC and to help control your use of the throttle as you can see the vacuum/boost real time.
Linear Mode
