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I installed the module in the car today just sitting on the center console and it works great. One observation regarding the fuel gauge. The driver on the lcd module and indeed the commercially available "zeva" fuel gauge driver from evworks i think all assume the gauge has a +12v supply and ground is via the tank sender. Perfectly valid for most older cars. My bmw is a 1996 model but uses a computer in the dash to control the instruments. Its not can bus or anything but the fuel gauge is not directly driven by the tank senders.
It uses 2 tank senders. One for each side. Both standard resistive elements. Approx 220 ohms on each side equals a full tank. 20 ohms is empty. Two problems. First , its not ground referenced. Second , although i can rapidly "fill" the tank by increasing the resistance , any attempt to "drain" it fast results in the gauge staying put. I would say a lot of modern and modern-ish vehicles will have this sort of system or someting similar. I happened to note that Jack Rickard's 2009 mini cooper (made by bmw) has the same two tank sender setup.
I'm looking at a possible fix using a digital potentiometer but all that i have checked so far are 5v only. Sender works on 12v. Any thoughts?
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Now, Cole, when you shift the gear and that little needle on the ammeter goes into the red and reads 2000 Amps, that's bad.
www.evbmw.com
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