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If anyone likes reading, here is the link to the 21 page DIY that I used to figure out our E53 gauge. TerraPhntm, SilberVogel and Mr, Philidelphia get all the credit for figuring this out in the first place. I wish those guys had owned E53s... ;) https://forum.e46fanatics.com/showthread.php?t=1013600 |
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Less than $80 and some of my friends over on E46F swear by it. UltraGauge OBDII Scan tool & Information Center |
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https://images-na.ssl-images-amazon....rL._SX425_.jpg |
Ultra gauge looks pretty awesome. The problem I have with WiFi dongle is it needs to be re plugged each drive cycle plus connecting to app on the phone, I didn't read deep enough to see if it is wired or wireless somehow
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http://img.tapatalk.com/d/13/04/27/yny7yzun.jpg |
That looks really cool! I was going to build a similar hard wired device using an arduino and put in the ashtray like that! I even found a small orange display (not easy) but it isn't readable in daylight!
RE: the the DME temp light thing. I was going to check that by changing the temp value while monitoring DME to see when gauge light comes on, just didn't have time yet. |
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UltraGauge OBDII Gauges |
So today I was monitoring the temp via the OBD cluster, and it sat from 90C-108C. Is this normal operating temperature? Where will the gauge be reading at? I'm guessing a bit over the center.
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20C=14 25C=19 30C=1E 35C=23 40C=28 45C=2D 50C=32 55C=37 60C=3C 65C=41 70C=46 75C=4B 80C=50 85C=55 90C=5A 95C=5F 100C=64 105C=69 110C=6E 115C=73 120C=78 125C=7D 130C=82 135C=87 140C=8C |
Well turns out the red gauge light gets turned on by a switch in the dual coolant temperature sender/switch. The NTC resistance portion feeds into the DME which works the gauge over whatever bus that is on and the NC switch portion goes directly to the light. So no coding that! ;( but would works out nicely for someone who wants to splice in an Arduino or voltage comparator to work the light.
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