Hi,

I was just wondering if anyone could give me some advice on installing a boost gauge.

The gauge that I have has an output for where you connect the vacuum hose and three wires, (i'm sure they normally come with only two).

The three wires are as follows in the instructions:

Black - Ground

Red - ACC

Green - Signal

I'm Ok with grouding it and I guess ACC is to connect to the ignition, but where do I connect the signal wire to?

Any help would be very much appreciated.

 

lighting circuit

 

Cheers for the quick reply mate!!

Another question for you though, (sorry..):

The gauge is similar to the Defi gauges where they are smoked black faces and to see the readings, the gauge has to always be illuminated.

Would connecting both the 12v feed wire and the signal/lighting circuit wire do any justice?

If not, where would you suggest.

Any advice is very much appreciated..

 

12v wire for power to the gauge? and the lighting circuit so it comes on with the lights.

If the gauge needs all day illumination, I would try using a permanant 12v live?

Read the instructions perhaps to clarify, !!

 

Cheers buddy!!

I have been looking over the instructions for the last two days but their in chinese.

Would connecting both the 12v feed wire and the signal wire to the + terminal on the battery or cigarette lighter positive wire do any justice?

 

Bit of an update.

The instructions say the green wire is for signal?

However the instructions also mention to connect the vacuum hose, so I'm a bit confused as to whether this boost gauge is electrical or mechanical..

Any opinions on this?

 

You could try connecting up the gauge then putting a 1.5 volt battery across the signal and ground to see if the reading changed. If it is expecting a boost signal then you should have some way of calibrating the gauge for different MAP sensors.

The other possibility is that it dims the gauge when the lights are turned on, (like the clock), and if that is the case then connecting to +12v should just make the display dimmer.

 

Cheers buddy, may have to give that a go with the 1.5 V Battery!!

All that came in the package was a gauge, vacuum house, transparent house, a few fixings and these three wires coming out the back!?!?

 

hello mate as far as i am aware you have a mechanical gauge because you have to connect the vac pipe directly to the back. If it was an electrical gauge you would have an additional sensor which your vacume pipe went to and then it would connect via wires to the gauge.
Regarding the wire you have you are right on the earth and the acc goes to switched feed from ignition so the gauge gets power when the ignition is switched on, if you were to wire it to the battery the the gauge would be lit up all the time, and the signal wire is to the lights so when you turn your lights on the gauge brightness reduces.

hope this helps weis101

 

Wicked mate!! Exactly what I wanted to hear.

Thank you very much!!

 

Fitted an Autogauge Smoke boost gauge like this a few weeks back, earth it out one of the smaller wires coming off the back of the ignition is a switched live that is easy enough to get a scotch clip round and then just joined the wire for the lights to the illumination wire on the back of the foglight switch again with a scotch clip (on the one I fitted this slightly dims the gauge when you turn the lights on presumably to stop it dazzling you at night). Then T the vac tubing into the relevant tube in the engine bay or if its a classic the facelifts have a rubber plug on the top of the engine which you remove and slide the vac tubing over.