Wiring Oil Pressure Gauge

[stingray]

Hi,

I've got an Autogauge smoke series electrical oil pressure gauge. The wiring diagram shows the oil sender unit with 1 connector only and the green wire connects to this. The gauge has 2 black wires and both of them are drawn connected to ground.

However the sender supplied has two connectors and one of them has the marking 'G'. I'm guessing this would be for the second ground wire comming out of the guage but my question is does it matter which black wire, out off the two, that I use to connect to the sender unit? One wire is thicker than the other if that matters.

Also with the 12V live wire there's two red cables. Again one thicker than the other. I'm assuming the thicker one is the 12V constant and the thinner one is the 12V accessories. Correct me if I'm wrong.

Ray

[stingray]

Here's the installation manual, figure 6. I don't think the gauge has any memory features so it won't be needing a 12V constant. I'm just going to try and connect both red cables to the 12V ignition ON. That way it should only turn on when the key is in the ON position.

[WazR32GTSt]

i bought the same gaugeand connected it as follows:

both blacks to round

both reds and orange to 12V (ignition)

green to the OPS as the sense wire

it works fine for me

[xRHETTx]

Pretty sure that the thick red one is for 12V ignition.

And the other one would be for illumination... unless you want the gauge to light up all the time.

[WazR32GTSt]

yeah but with that gauge, the difference between "lights on" and "lights off" is pretty much nothing

i wired up my autogauge boost gauge to the lights, and when i turn the lights on it makes almost no difference...

so i figured i'd just wire up my oil pressure gauge with the lights on..

plus, mine is hidden in the glove box anyway so its never exposed to full sunlight