Dash boost gauge

Ronin · #1 15-10-2009, 18:02

How does the dash boost gauge read pressure is it connected to a vacuum pipe? If so where does it run from? The dash boost gauge is not moving it's staying on 0 while the boost gauge I've fitted reads a vacuum but not boost so I'm thinking that the dash one must have a leak somewhere.
Thanks in advance.

umpkin · #2 15-10-2009, 20:02

the dash one is piped from the brake servo unit, there is a pipe that comes from the inlet to a T adaptor, from there a big pipe goes to the brake servo, and a little one goes off to the right along the back of the engine bay, it then goes into a brown round plastic "thingy" and then continues to the boost sensor below the windscreen wiper motor, its quite a big ish black box on a bracket, if you look it does have boost sensor stamped on it.

mine had a naff pipe going on the brown round thingy.

boost gauge needs to be piped between the Throttle butterfly and the engine, basicly on the inlet manfold, so it measures boost and vacum.

umpkin · #3 15-10-2009, 20:12

circles from left to right

1. junction where little pipe comes from

2. Brown/black thingy (mine had perished rubber pipes each side)

3. Sensor box is behind the power steering resvoir

hope this helps.

Ronin · #4 17-10-2009, 10:00

Cheers I'll take a look today.

Ronin · #5 17-10-2009, 20:03

Job done the pipe had split where it comes off the brake servo, trimmed about 5mm off put it back on and the dash gauge works perfectly. As to the one I've fitted the needle is sticking on lose glass but the bezel won't tighten or come off to fix this so looks like new gauge time.

umpkin · #6 18-10-2009, 08:27

glad yer sorted it m8.

lmrdave · #7 19-10-2009, 08:47

Dom I've got a boost guage going if you want one. Will be listing my parts for sale some time today!

Magical Trevor · #8 10-08-2010, 19:17

Bring a old post post back to light as im having a similar problem. Basically on switch on boost gauge levels up to 0psi and remains there until switch off.

So I had a look in my engine bay for perished hoses as umpkin(hope ave spelt it right working from memory) suggested and i found my boost sensor but its a little silver box :S there was a thin rubber hose runs up and along the front of the bulk head. and runs all the way along until it connets to nothing heres some pics.

Heres my T connection this right?

Heres where the pipe ends the T connection ^ is to left hand side of my hand.

I cant see anywhere this connects to? is it ment to join onto the T connection? As umpkin said it connects to.... cant memba what it was, as well as the boost sensor.

Hope that explains it.