quick question, when you have a boost gauge removed should it read 0? mine reads 10, should this be?

 

I don't want to overwhelm you with technical jargon but your **** is fucked up.

 

damn, when i turned down my compressor to about 5 psi and blew it into the gauge it read a 5psi gain, but to 15 and not 5, it was a freebie too..

 

10 what? kpa? atmospheres? psi?

most mediocre gauges (autometer) read 1-2 psi off at rest.

Defi cheats by making everything point straight down... so technically mine reads 30inHg of vac at rest
http://gallery.y8s.com/miata/turbo/DSC00656.jpg.html

 

oh in that case see if you can move the needle. if there's a stop, figure out what PSI you'd have to put in it to read 10 past that stop

 

Most mechanical vac/boost gauges should read zero when the engine is off or the gauge is disconnected.

Electronic gauges cannot be counted upon to read any specific value when de-energized. Some will return to the lowest point on the scale, some will just jump to a random value, some will remain wherever they were when power was cut...

 

the only thing electrical about this one is the light i soldered into the back that was missing, the rest is mechanical