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Old 07-19-2012, 06:09 PM   #1
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Default AEM UEGO wiring input (how did you wire yours)

Where did you pull your switched 12v, constant 12v and ground from?

I am running the switched 12v and ground off the same source as Megasquirt and my 12V constant from a 12v source from the old stereo wiring.

The problem I am having is when the meter is displaying an afr of 12.5 the signal MS is seeing says 13.5, a little too far off for my liking. Also MS is set up for AEM linear.
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Old 07-19-2012, 08:17 PM   #2
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I'm likely going to wire it like I did last time, with a relay off of a switched power fuse, cruise control sounds good, to a distro block and fuses to do all the switched power for gauges. And then the couple that need constant power will get it fed straight to the gauge fuse block from a constant power fuse.
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Old 07-20-2012, 05:46 PM   #3
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So did you have a uego, did you wire the switched off the cruise control, and what constant power source did you use?
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Old 07-20-2012, 07:21 PM   #4
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That was how I wire any gauge with those wiring requirements. I do not know if the cruise is switched power for miata's and I'll need to look in the fuse box to figure out the best constant source to use. Last time I wired in gauges the relay also powered my intercooler pump (air/water) so I pulled directly off the main terminal under the hood with an inline fuse. But you dont need that much current for just a wideband.
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Old 07-20-2012, 07:37 PM   #5
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I just used the stereo wiring since it was closest, although I'll be rewiring it to the power/ground on my DIYPNP once I get off my ***. No issues regarding TS/gauge being different.

There's only a power and a ground, did they change the wiring? There should only be four wires - power, ground, afr voltage output, afr serial output IIRC
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Old 07-20-2012, 08:26 PM   #6
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I picked up the analog meter uego back in April and it calls for a switched 12V and a constant 12V (along with 2 signal wires, a dimmer input, and ground).

Last edited by astroboy; 07-21-2012 at 10:20 PM.
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Old 07-20-2012, 08:54 PM   #7
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I did mine exactly as leafy did, wired it to the DIYPNP through the DB9 connector
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Old 07-21-2012, 10:23 PM   #8
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So the db9 was your switch and all the power came directly from the battery? What did you source for the ground?
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Old 07-21-2012, 10:59 PM   #9
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Everything went through the db9. It is powered and grounded from inside the MS
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Old 07-22-2012, 02:06 AM   #10
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Quote:
Originally Posted by RyanRaduechel View Post
Everything went through the db9. It is powered and grounded from inside the MS
does that eliminate/reduce the variance between the AEM and the MS?
if not, what did you do to bring the two into agreement?
and is the agreement over the entire range?
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Old 07-22-2012, 12:45 PM   #11
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I did nothing to calibrate it. The gauge read spot on to what it showed in Tunerstudio so I didnt mess with it.
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Old 07-22-2012, 01:43 PM   #12
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Did you switch from volts to afr/scale your afr table?
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Old 07-23-2012, 11:28 AM   #13
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Quote:
Originally Posted by astroboy View Post
Did you switch from volts to afr/scale your afr table?
Did you? That could be why they are reading different. I had to switch mine over upon initial startup. I wired mine through the MS as well.
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Old 07-23-2012, 12:48 PM   #14
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I did not although after I made this thread I noticed Joe's thread on doing so.
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