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TDI Power Enhancements Discussions about increasing the power of your TDI engine. i.e. chips, injectors, powerboxes, clutches, etc. Handling, suspensions, wheels, type discussion should be put into the "Upgrades (non TDI Engine related)" forum. Non TDI vehicle related postings will be moved or removed. Please note the Performance Disclaimer.

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Old April 14th, 2010, 16:16   #1
HysteriaRunRiot
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Default MK4 Golf PD boost gauge install help

I feel really stupid here, but i looked around, and i couldn't find simple instructions, i know this isn't complicated. It's more that i don't know where to tie in the vacuum line.

Also, I got the Vent mount, if anyone has some pointers on that
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Old April 14th, 2010, 20:00   #2
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you dont tie into any vacuum lines, you are reading the instructions for different types of cars. what you need to do is take out the plastic charge pipe from the intercooler to the 90 degree to EGR hose and drill/tap an adapter to the nylon tubing.

http://i199.photobucket.com/albums/a...Image001-1.jpg


and check out the bottom few photos on this PDF
http://pics2.tdiclub.com/pdf/gauge_i...W_Golf_TDI.pdf
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Old April 14th, 2010, 20:06   #3
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Also, use the grey/blue wire on the dimmer and any ground....
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Old April 14th, 2010, 20:31   #4
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ahh gotcha, so, there's no way to tap into some other line?

also what is that adapter?
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Old April 14th, 2010, 20:57   #5
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Napa and hardware stores should have it. It's like a threaded brass hex fitting with male threads on both sides. On side threads into the boost plumbing and the other gets a cap that hold onto and seals the nylon tubng. You can see it in the pic. The gold thing.
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Old April 15th, 2010, 03:36   #6
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no, i mean dimensions, that's a compression by male brass fitting, the tubing goes into the compression end, so i'm assuming it has to be 1/8" but what size is the end that goes into the whole I drill, or does it not matter
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Old April 15th, 2010, 06:27   #7
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it doesnt matter, i just drill a hole a bit smaller than the threads and then just thread the fitting in there. it should tap itself. i just told you to tap it because tapping it is the correct way to go about things, but not completely necessary.
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Old April 15th, 2010, 06:27   #8
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and yes. my autometer was 1/8th inch compresssion fitting and tubing. i dont know what kind you have.
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Old April 15th, 2010, 08:19   #9
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1/8" NPT (National Pipe Thread) is the thread size. The correct size drill bit to use prior to tapping is 11/32".
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Old April 15th, 2010, 12:21   #10
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ook i'll stop by the hardware store later today, thanks guys
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Old April 29th, 2011, 11:57   #11
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this is going to sound very stupid, but which ground?

is there a more easily accessible one? i can't get my gauge to light
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Old April 29th, 2011, 12:22   #12
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Your gauge may have 4 wires.

A permanent ground (-)
A permanent positive (+) to keep the settings if its a steppermotor gauge
A switched live from the ignition (so it knows when to turn off and on)
A supply from a dimmer wire so it knows when to dim its light when you put the lights on like the rest of the instruments.

I used the wires that feed the CD player, i did away with the dimming light function and left it out.
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Old April 29th, 2011, 13:22   #13
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yeah, i found a grounded bolt, that's all i needed, thank you though
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Old June 28th, 2015, 09:39   #14
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Hey sorry to open this thread up,

I installed a boost gauge connected to the intercooler pipe like everyone has shown.

Im not sure if this is normal but I get weird boost readings. When accelerating hard it will read up to 2 bars then the needle will start going down. Also it always makes an annoying rattle.

I can post a video if it helps.

Any suggestions? Would a bent/kinked boost hose maybe cause this?
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Old June 28th, 2015, 09:59   #15
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Likely two things

1) Most gauges are not damped and therefore will buzz due to the intake pressure pulses from the valves. Look at putting an orifice (0.020" or 0.5mm) at the intercooler pipe. If your fitting is brass, you can solder it shut and drill it out.

2) You likely have sticky vanes or a mis-adjusted actuator causing the 2 bar spike. Get this fixed (or stop stomping on the throttle) else you'll be putting a new turbo on soon
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