i just bought this gauge from a member on the forum in the FD section.



is it a problem that the needle is way off with no electricity applied to it? i would assume it would be like at zero (or 30, wherever the peg is)

there are 4 wires that are on the power harness. black/white/red/orange
i hooked black and white up to my battery to test stuff out and the gauge lit up nicely. then i hooked up the water temp sensor and the needle didnt move. SO, i figured that either the red or orange wire was the power to the sensor... well, i hooked up the red wire and the needle went the wrong way and headed towards the needle (to the left if looking at the picture)

shouldnt it go all the way around and rest on the other side of the peg?

 

someone help.

anyone know how to open these gauges up? i just took the two screws out of the back and i cant get it apart...... i hate life

 

Red = 12V Constant
*Edit* Orange = 12V ignition
White = 12V Light Source
Black = Ground

hook it up and see what happens with everything done right.

 

just hooked it up like that, same result. its kinda like the needle just got rotated 180 degrees...

i took off a little circle piece of tape on the back of the gauge and there are two tiny little electronic adjustment screws. could this be what these are for? i took the two main screws out of the back of the gauge and cant get the ******* thing disassembled, its like the casing is all one piece so you cant take it apart, but you can take the screws out that hold the insides down in place...

 

all the lights and everything works fine. its just like the needle is resting on 200*C (way on the wrong end of the gauge) instead of the zero (well, 30*C)

is there any way to just rotate that needle? i cant seem to get access to the face

 

Hopefully you didn't short the sucker out playing guessing games with the wiring (kinda sounds like you did).

Btw, I can finally answer your question from a month ago about compression numbers on my rebuild. She's got about 5,000 miles on her now, and I tested her cold this morning just for $hits and grins. 110 psi, give or take a couple, all faces...Since there's no OMP, that's in fairly dry housings too. Not bad, eh?

 

Take it to an instument repairer and have them check it.

 

Why would a gauge need a 12vdc constant supply? does it have a memory of some sort?

Most gauges have (other than the light wires) ground, 12vdc+ switched, and sending unit wire. Note that the sending unit must also be grounded for it to read.

Ive never seen a gauge sit off to the side like that...was it that way when it came? Looks screwed up

 

An "instrument repairer" huh? Yeah buddy, we have those on every corner here in the american southeast (i.e. redneck country) don't we jacob?

Hell, you can't even find anyone willing to repair home or car audio/video stuff around here. Basically if something high end like that screws up, you either send it to the manufacturer or you buy another one.

 

All the greddy's have a constant +12V, then they turn themselves on with the ingition (even if they don't have the memory option) Perhaps this is to speed the process up, or they were just too lazy to actually change the gauge from the memory style to those without?

 

I've never had a problem finding one locally, but then I live in a city...

 

I live on the outskirts of one of the nations largest cities, there are over 3.5 million people in my county....I've never even heard of an ''instrument repairer''

At any rate, my greddy boost guage does the same thing as that water temp guage. When I turn the car off, the needle rests on the right edge of the guage.
I have an increasing suspicion that I wired in the ignition and 12volt source together out of laziness however which should explain why that happens.

 

I simply went on GReddy.com.. looked in technical and found the wiring diagram. Then posted the results here.

 

the problem is not the wiring. its like the water temp sensor isnt even hooked up. i put it down in 200* water and plugged it into the gauge (the gauge already hooked up to the battery) and the needle didnt move.

 

Ah, you haven't heard of one go they don't exsist right?

Look in the Yellow Pages and you might be surprised. There are companies that specialise in the sale, repair and calibration of gauges. I've never had a problem finding one in Auckland (1.4M people), so it's ridiculous to say you can't find one in Houston.

 

ok.

bottom line: i got ripped off and wasted 110 dollars.