Boost Gage not working

[Dr_Gonzo]

My old man and myself recently put in a new secondhand engine and ever since then the boost gage seems to be stuck at slightly above zero when the engine is running. Who can i rectify this

[chris2]

what happens when the ign is off, and obviously checked where it plumbs in yeh..

[Dr_Gonzo]

When the ign is off it drops like all the rest. Me thinks it's just in connected wrongly. (Sleep dep + min. mech. Knowledge = silly mistakes)

[JeffET]

Are you talking about the std boost guage on the dash next to the fuel guage etc?! If so, I wouldnt bother trying to figure out what it reads, but Id be getting a proper boost guage instead.

Idle should be around -17kg/m2 when idling (cant quite make it out in the pic I got here), depending on what mods u got.

[Paz]

yeh my standard boost gauge does what it likes from day to day..... power remains relatively the same tho...

it usually sits around 0, then moves up at a different rate everytime..... sometimes fast, straight to top of gauge, and sometimes hardly at all..... im not sure, probably just the connection..... lil' help!...

[Nisman]

i think (dont quote me) the black box on the fire wall in about the centre of the engine bay is the sensor for the dash boost guage.
check the vacuum lines going to it are not split, and the wires comming out are connected.

if its a normal boost guage, check the line isnt pinched, or blocked.

[pixie]

I remembering having this problem. Or something similar

You have to make sure the gauge is hooked up to the correct plug.
Theres a plug in the front-bottom of the inlet manifold with two small pipes sticking out of the bolt. One connects to fuel pressure regulator and the other connects to the bost gauge.
Between the boost gauge and the manifold is a small circular black plastic thing (which i guess stops pressure leaking out of it) - check that it hasn't been put on back-to-front (not sure if possible).

When at idle it should read -5, at 3,000 about 0 at about 3,500 +5 (standard that is).