Boost gauge reads 0 psi while car is off

[volkerding95GSX]

why does my boost gauge stay at 0 psi while the car is turned off? Usually the needle would drop all the way to the bottom of the vacuum reading when the car turned off, but starting 2-3 weeks ago it stays in the "9 o'clock" 0 psi position. Everything works fine when the car is on, so i'm not too concerned, just curious.
Happy Tuning...

 

[DSMDriver69]

Are you talking about a aftermarket gauge?

 

[BLINKY619]

sounds to me like hes talking about the stock one witch is trash....!

 

[ziggo0]

If the car is off it should be at 0psi, no vac and no pressure. If it's a Prosport Electronic style gauge that uses a sender it may use a stepping motor to turn the needle, I had one of these and sometimes it would go always to the left (vac) when off and sometimes it would just stop where it was at.

 

[ilco187]

well if there is no vac or boost 0 psi

 

[volkerding95GSX]

Sorry for not specifying: Yes, it's an aftermarket SPI boost gauge. And if you look at it like a clock: 6 oclock is 30 vac, 9oclock is zero psi, and 3 oclock is 30 psi. All i'm saying is that for the past year when the car was turned totally off the needle would drop to the 6 oclock position. But now it remains at the 9 oclock position when the car off. I thought i'd say somthing in the one in a million chance this means something bad with the gauge or line.

 

[tweek814]

Sounds like its operating as it should. I wouldn't' complain.

 

[rarest_90_DsM]

for the last year you've had a broken gauge! It should rest at 0 no boost no vac i would get a new gauge. wouldn't risk inaccurate reading, if its been reading 30vac for the last year with the car off its probably broken just my 2cents though

 

[Sandman817]

hey volkerding, i had something similar happen to my autometer boost gauge. When idling it would only read 10psi of vacuum. If i tapped the gauge, the needle would bounce a little bit and go a bit higher. I took the gauge out and found that one of the brass rods that are in teh back of the gauge fell into itself and was touching one of the terminals. i pulled it out and now everything works great.