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Why is my boost gauge only reading vacuum and no boost?

G

gtp02

New member
i installed my autometer boost gauge in my 02 gtp today and it reads vacuum but when at full throttle it reads no boost
 


You most likely installed the line in the wrong place. You need to come off the port under the supercharger snout in the lower intake manifold.
 
^^pretty sure that is the line off the MAP sensor underneath the EVAP purge lines in the back behind the blower.
 


Yeah mine is doing the same thing but I have a 05 GTP, I thought you just had to stick it in that hole above the supercharger?
 
from the MAP sensor on the back of the supercharger...it has a big white plug in it. Can't miss it...T off of that line.
 
Ok I was able to do it. I found another line infrot of the supercharger that I was able to splice into. It works? shows vaccume and boost fine. How much boost should I be making?

Also how do you wire it so that the gauge can light up?
 


5-10 psi, idk because your modded. A stock GTP is around 7-8 psi.

With your flow mods and such it will cut down on boost PSI, but you still get the power because it flows better.

Splice the wire into a wire that always gets power when the key is on or buy a TAP A FUSE or ADD A FUSE, thing at a local auto store and use that on you radio fuse.
 
Fivefingerdeathpunch said:
5-10 psi, idk because your modded. A stock GTP is around 7-8 psi.

With your flow mods and such it will cut down on boost PSI, but you still get the power because it flows better.

Splice the wire into a wire that always gets power when the key is on or buy a TAP A FUSE or ADD A FUSE, thing at a local auto store and use that on you radio fuse.
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I'm getting around 10 psi :-)

This weekend I'm going to tap it in so that when the lights turn on at night the gauge will also
 
BillBoost37 said:
Not being a douche, but you might want to have a buddy with some experience help you. The directions tell you how to light it up. One wire to ground, one to the light circuit.
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Its cool man I just thought maybe there would be a wiring kit for it or something thats more of what I wanted to know. I've done wiring on cars but never as new as my GTP :th_winking:
 
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