when ever ur car is off wat should the boost gauge say, mine says vac 20 and all my friends say it should be at 0, should it be?

 

It depends. It stays at the position it was in when you turn it the car off. If it was reading 0 when you turn the car off, it will stay at 0. Same thing with 20 vac.

 

After shutting the car off, turn the key back to the "on" position but don't start the car. It should reset to 0.

 

It is electronic, so when the power is cut to the gauge, the needle will stay at that position until the power comes back; which then at that time it will reflect the current vac/boost reading.

 

Mine stays at whatever I shut it down at, but yea like he said before if you key it on for a second it will reset itself to zero!

 

the boost gauge is reading from the ecu, not the vac line. if u open ur door while shutting it off the needle wont have power to zero out.

 

mine just goes to the bottom.. its eletric.. i dont see it holding a position when off?

 

like turbo tech said...

an electronic gauge will just go to whatever position (for example 20 vac ) when turned off... if u turn the car on but not start it will be at zero

mechanical gauges, when turned off will be at zero (if accurate--i had a boost gauge on my old turbo eclipse that i had to send back bc it "zeroed out" at 2psi)

 

My stock boost gauge zero's out at like 1 inHg. What could i do?