DIY: Oil Pressure Gauge

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Can you post or provide a link to the instructions? I suspect that the orange wire may control the illumination of the gauge ... however, I would need to see the instructions to confirm.

filip00

Sure, here it is:
https://imgur.com/6QKmbk6

this is what is important:
https://imgur.com/VPwYc0i

The cable has 4 wires, Black, Red (+ and -), Orange, White.
The white wire can be ignored, as it's used to provide white illumination.
On the right side you can see the combinations for different lightings, and the one with orange wire is what I'm after. I'm only confused with where I'm supposed to connect it.

40 to 332

OK, in terms of the orange wire, I'd suggest reviewing the posts under this heading:

Defi Oil Pressure Gauge - Need Advice

If you have a copy of the FSM for your model year, you should be able to locate one or more connectors with a wire marked ILL(+) that form part of the main harness. If you splice into one of these wires, the gauge should illuminate and also dim when the headlights are turned on.

filip00

I'm having troubles with my oil pressure gauge, and I have no idea why.

So what happens is - my fuses (10A) are blowing non-stop.

Let me run you through the current setup and situation:
-The pressure gauge is added to the fuse box via add-a-fuse on the blower/audio slot, and I used 2x 10A fuses to run it.
-It was running well for over a year, but last year it started to show weird readings - as if everything was shifted up by cca 30psi. For example: instead of showing 20psi in idle, it would show 45psi. On full gas it also showed too high reading. It did once go back to normal, but usually showed too high.
-So over the winter, I bought a new oil pressure sensor, figuring that my old one might be broken and replaced it.
-First moment I connected it, it blown a fuse. I switched wires on the sensor, figuring I might've misconnected them....it then worked - but again broke very soon.
And ever since - it's been blowing the fuse basically within a minute or few whenever I try to run it.

I tried to change the wiring for the pressure gauge - but it didn't work. Below I'm quoting the pressure gauge diagram... and just for info - I had it connected with both orange and red wire together - and to the fuse. I figure that's OK....but blowing the fuse confuses me.

Any ideas? Thanks in advance.

__________________
ride epic drive epic

40 to 332

OK, so as I understand things, you installed a single "add-a-fuse" to the blower slot in the fuse panel. The add-a-fuse should have two slots ... one for the original factory fuse and the other for the fuse for the new circuit that powers the pressure gauge. It appears from your post that you installed a 10 amp fuse into each of the two slots. That may be your problem. The blower circuit requires a 15 amp fuse. I'd suggest referring to the instructions that came with the add-a-fuse and identify the slot that corresponds to the blower circuit and replace the 10 amp fuse with a 15 amp fuse. You can keep the 10 amp fuse in the slot that powers the new circuit (i.e., the pressure gauge) since the gauge itself will draw little power (i.e., less than 10 amps). Alternatively, read and follow the instructions below:

It appears that you're running both the red (+) wire that powers the gauge itself and the orange (illumination) wire that controls the lighting in the gauge from a single add-a-fuse. I'd suggest installing a second add-a-fuse. You can install it in the cigar lighter slot in the fuse panel. Use the original add-a-fuse to power the illumination circuit (i.e., connect the orange wire to it). Use the second add-a-fuse to power the gauge itself ( i.e., connect the red wire to it). Fuse selection should be as follows:

Original add-a-fuse : 15 amp fuse for the blower/5 amp fuse for illumination (orange wire) circuit. (According to the instructions in your earlier posts, it's rated at 2 amps).

Second add-a-fuse: 15 amp fuse for the cigar lighter/ 10 amp fuse for the gauge (red wire) circuit).

Trust the above helps!