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Old 01-09-2013, 02:46 PM   #1
Scooby Newbie
Member#: 178411
Join Date: Apr 2008
Chapter/Region: MWSOC
Location: GR Mich
98 2.5RS/V2 WRX
04 STi

Default Greddy V2 Gauge Wiring Question

Not sure if this belongs here or electrical/lighting - Mods please move if needed.

For about a year, I have been using a Greddy V2 electronic oil press. gauge in my 04 STi wired per the instructions with no issue. Recently, I needed new gauges for my WRX Swapped 98 Impreza RS and decided to go with 2 more of the Greddy V2 electronic gauges - Boost and Oil Press. Again, I wired them per the instructions, however I noticed something the first time I plugged them in - The needles did a 270*start up sweep. However, they don't do the sweep on subsequent starts, just the first time power is applied.

I currently have them wired in my RS per the instructions, or as follows:
Red - Constant power - Radio constant power (blue/red stripe)
Orange - Switched Ign. power - Cigarette lighter switched 12v (yellow/red stripe)
White - Switched ign. 12v (illum)
Black - ground

I played with them and noticed that if you switch the "constant" power on the red wire, they startup and sweep every time. Wiring as follows:

Red - Switched Ign. 12v (cigarette lighter)
White - Switched ign. 12v illumn.
Black - ground
Orange - open

The only problem with this is when I turn the car off, the gauge needle doesn't fully drop to 0. I think this had to do with removing power completely from the gauge, the motor can't be driven to 0.

My question is, How can I wire these so that they perform the opening sweep on start-up, but have power to fully turn off? In all of my searching I only found one person who mentioned using a 12v constant power source that is "off" when the key is on the "start" position - However this isn't really constant power, and deviates from the instructions.

For reference, heres a video of the same gauges doing the start-up sweep I found on Youtube:


I have sent an email to GReddy tech support, but no reply. I understand these gauges are discontinued, so I may just be SOL.

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