Reading the Greddy Gauges?
 

I just bought a GReddy Electronic Boost Gauge and on the face it says numbers as 736, 500, 0, 0.5, 1.0, 1.5, and 2.0..............my question is how do i read the boost on it? does 1.0 mean 10 lbs of boost? any help is appreciated thanks guys

1.0bar = 14.22 lbs

i don't remember the conversion for vaccuum but you can find it somewhere else on the internet.

1 bar is 14.7 psi.

1 kg/cm^2 (kilograms per square centimeter), which is what the GReddy guages are in (or, at least, what my GReddy guages read) is 14.2 psi.

The values below 0 are mmHg (milimeters of mercury).

As for reading them, vacuum (below zero), depending on your porting, anything from about 350 to 500 is normal. Ported engines are normally towards the lower end of the scale. Stock boost (10 psi) is just a hair above 0.7 kg/cm^2.

Yea, 10psi should be right above the .7 mark.

I can't figure out my vacuum though, it's 0.5, 1.0, 1.5.

Apparently, it's 14.5 PSI... Not splitting hairs though.... :)

https://www.rx7club.com/forum/showth...threadid=33293

1 bar = 14.5 psi

1kg/cm^2 = 14.2 psi

25.4 mm = 1 inch, normal idle is 15-20 inches => 380 -500 mm is normal

My vacuum at idle is always between 0.5-0.6, so I would assume that is 500-600.

Is that high for a non streetported motor?