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Looks like one has to get a separate small box and make the digital unit fit.
Its a DIY unit. Buy the parts and make it type of deal.
There was nothing out there, plus I made them for my BMW motorcycles where I wanted something small. After some dingledorf kid on a cell phone wrote off my BMW motorcycle in Austria, I had a spare...so it went in the Porsche.
I don't like using a lighter circuit unless it is at exactly battery voltage; they're not always.
This draws 10mA at rest unlike the Datel that @IXLR8 used which draws only 2mA, so I used a switch to turn it on/off. That said, this generic LCD is, ah, 1/10 the price of the Datel. 🤣
The Amazon one should work, provided that you are okay with the silkscreened “VOLTMETER DISPLAY V” aesthetics. You would still have to make up your own switch if you want one. Also the Amazon one has no adjustment. If you want good accuracy, you almost always need to calibrate these types of things as they are always seemingly off by 0.1-0.3 volts….. check out the reviews.
I made a big one and a small one and had to calibrate both ….. both now are accurate and round up to the nearest tenth of a volt at five one-hundredths of a volt.
appreciate the depth of knowledge on it. My use case is to alert if < 13V start looking for charging system issues. What would be cool is to figure out a way to have that in the factory LCD display,
appreciate the depth of knowledge on it. My use case is to alert if < 13V start looking for charging system issues. What would be cool is to figure out a way to have that in the factory LCD display,
You could hijack the factory display with a Raspberry Pi, create alarms, spit notifications to your phone via bluetooth, etc ….. that would be a lot of work though.
I added a switched socket to my dash in the unused USA **** location next to the constant-on lighter socket where a voltmeter/USB outlet adapter now sits. Here is how I did it:
Nothing wrong with those as long as the cigarette lighter it is plugged into goes "dead" when the ignition is "off". Or you can pull it out, as long as you do not forget to do so.
Trouble with LED displays is they draw far more current compared to LCD displays, way more unless things have changed.
I have this one in my daily driver Acura RDX, but it shuts down when the ignition is off. Got it on Amazon for about $15.
The 993 and my motorcycles have the LCD display that I built and the 991.1 GTS came with one in the MFD. I like the fact that I can see the voltage display all the time (connected directly to the battery for an always-on disply) when I walk by my vehicles which is why I used a low-current draw display, plus the fact that some batteries have low Ah.
Trouble with LED displays is they draw far more current compared to LCD displays, way more unless things have changed.
Exactly - @IXLR8 ’s Datel LCD pulls 2mA, whereas my generic meter pulls 10mA; this is why I added a switch - to prevent draining the battery.
That being said, I’m a big freak about aesthetic consistency - using a yellow/amber voltmeter display was the only way I could match the look of the display on the Porsche / Becker CR-220 above the ashtray (seen in above photos).
As well, I’m quite fond of my CR-220’s cassette performance, optimized display polarization angle, and my added Bluetooth functionality, so I was not about to give that up 😂.
04-05-2011, 12:49 PM
Voltmeter 12 V LCD gauge
