I use vacuum/pressure bi-color (red/blue) EVO gauge for my Z32 and I'd like to share one idea. Gauge can be red or blue color, depends on wire connection. I added vacuum/pressure switch to the schematic. Switch has been pulled from old furnace with inducer motor(or you can buy new switch from HVAC supplier). Now I have blue color at vacuum and red color at pressure. Switch is very sensitive, you can see how "0" goes from blue to red.

 

very cool and inventive Idea

 

That is pretty neat. Got a video of it in action?

 

https://www.youtube.com/watch?v=yN71...ature=youtu.be

 

Coooool

 

Alex you are brilliant, thanks for posting the Video, I shared it on the 280zx and 300zx FB sites and a link to this thread, everyone needs to see this !