Custom outdoor temperature display!

Jason B

Official Vendor
Ever since I got my 4Runner, I wanted an outside temperature display. It's good to know when it's below 32°F outside, and when it's 100°F before your tires melt.

I wanted it to look custom, (I didn't want to have it sticking on the dash) and have a "green" backlit display to match the dash. I also didn't want any visible wires. I looked around a few places and found one that was powered by one AAA battery. I wanted to run it off 12 volts, and have it hardwired. After a lot of trial and error, I found the right wattage resistor needed to convert the unit to 12v. I got power (+12v) from the cigarette lighter with the wires hidden behind the dash. I'm also using this to power the digital volt meter.

Once I had the conversion done, I had to find a place to mount it. The ONLY logical place seemed to be under the ashtray. I used to put my sunglasses there, but they always came flying out when pulling way from a stop sign. Now, the new piece works as a holder, and whatever you put behind the temp gauge STAYS PUT in the pocket.

I used a piece of wood laminate that comes in sheets, (it's pretty thin, and flexible, similar to plexiglass). It's very close in color to the "Limited" wood trim and blends great. I first made a template out of thin black plexi which I almost used as the final product, but I didn't want the piece to look added, (the wood was just too good of a match). I needed to cut the ends so they would fit the curves of the console, and cut out the middle for the digital display.

Getting the new wood laminate piece to stay in the dash wasn't to bad. I used some small "L" brackets I had in my basement. I used 3M double stick tape to adhere them to the left and right side of the inside pocket, and put another piece of double stick out the outside of the L brackets, so they would stick to the back of the laminate.

The unit also has a temp sensor wire that must be run outside the vehicle. I brought the sensor wire out behind the dash and tucked it under the top of the factory carpeting in the driver footwell. I then ran it through the big rubber factory grommet at the top left. I also have my 4 gauge power wire, and driving light wiring going through here as well. I was able to push it through with my fingers and didn't need a hangar this time. Once I got it through, I then opened the hood and ran it all the way up, past the battery and down behind my PP spoiler/valance, and stuck it to the inside lip on the spoiler. This seems to be the best place. The spoiler shields it from the sun, and it's far enough way from the engine.

temp_721.jpg


More pics here:

Jason's 4Runner Limited
 
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awesome! love that you found such a good match for the laminate.

Ever since I made the switch from my subaru to the Runner I keep looking all over my dash for a temp readout, and I've been thinking I gotta look into a way to add one.

do you have a link to the thermometer and resistor?
 
That looks really good man!

One question though; if you have a LTD T4R, don't you have the exterior temp display on the auto ac control panel?
 
A better solution than using a resistor to drop the voltage for the thermometer would be to use a voltage regulator. Probably a 1.5V regulator...

-Charlie
 
awesome! love that you found such a good match for the laminate.

Ever since I made the switch from my subaru to the Runner I keep looking all over my dash for a temp readout, and I've been thinking I gotta look into a way to add one.

do you have a link to the thermometer and resistor?

You have to experiment with different wattage resistors and measure the output of the unit with the batteries in to detemine what wattage resistor to be used. Each unit is a little different, so it can take a while. I have it somewhere, but will have to dig for it.

This is the one I used:

https://www.amazon.com/Bell-Automotive-22-1-28001-8-Slimline-Thermometer/dp/B000IG3QOI

Now, just did more digging and found this, a 12 volt version!!!. This didn't exist when I did mine, I did that back in 2003! ha.

https://www.ebay.com/itm/141731838162?ul_noapp=true

s-l1600.jpg
 
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A better solution than using a resistor to drop the voltage for the thermometer would be to use a voltage regulator. Probably a 1.5V regulator...

-Charlie

You have more info on this? Or what it looks like, etc, and how to wire in? Sounds cool.

That looks really good man!

One question though; if you have a LTD T4R, don't you have the exterior temp display on the auto ac control panel?

Limited's only had that from 99-02, 96-98 had manual controls. At one time I wanted to swap my manual controls out for the limited digital, but now it seems they're more trouble than they are worth as they break, and the display can mess up. Guess older can be better sometimes.
 
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You have more info on this? Or what it looks like, etc, and how to wire in? Sounds cool.



Limited's only had that from 99-02, 96-98 had manual controls. At one time I wanted to swap my manual controls out for the limited digital, but now it seems they're more trouble than they are worth as they break, and the display can mess up. Guess older can be better sometimes.

That clears it up. I did not know the auto climate control only came on the 99's-02's.

I do know one thing. The outside temperature sensor on my 2000 T4R LTD is actually mounted behind the grill and lower down on the driver's side. When my auto ac control was acting funny, I replaced it but it turned out the controller was shot.....
 
You have more info on this? Or what it looks like, etc, and how to wire in? Sounds cool.
Did a quick bit of digging... Alkaline voltage starts at 1.5V and drops down to around 1V before being considered 'discharged' - which means 1.25V will work - which means a standard 'adjustable' regulator chip can be run in a very simple configuration.

I'm talking about a simple 3-terminal IC like this:

http://www.ti.com/lit/ds/symlink/lm317l.pdf

$0.43 in small quantities:
https://www.digikey.com/product-detail/en/texas-instruments/LM317LCLP/296-33312-5-ND/1510138

You connect the voltage in to one side, ground to the 'adjust' pin and the output to the power input pin of the thermometer. If the thermometer draws too little current, you may need to put a 470ohm resistor between the output and adjust pin to keep regulation.

*or* you could find a '12V' thermometer. :banana:

-Charlie
 
Looks good man! Here’s my take, Clock, Voltage, and EXT temp, all in one:)
 

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Any info on this? I'm jelly!

Mine was made by scratch as a electronics project a while back, but these days you can find 'lcd panel displays' that have all 3 features mine has off of amazon for cheap, but keep in mind the temp probes that those kits usually come with aren't accurate at all and will need to be upgraded
 
I just use the weather widget off my phone :p
Seriously though,I do use the widget a lot since I travel 300-350 miles nightly at work. I like to see what I'll be driving into so I can plan a route detour in advance, for example in the winter it would be clear within a 50 mile radius of my office but once we cross into the Poconos area of PA it's freezing rain and black ice all over the highway.
 
This is the best thing I've ever done for the interior. You take it for granted, but every newer car has this. You'd think aftermarket radios would include this for those that wanted it.
 
Mine was made by scratch as a electronics project a while back, but these days you can find 'lcd panel displays' that have all 3 features mine has off of amazon for cheap, but keep in mind the temp probes that those kits usually come with aren't accurate at all and will need to be upgraded

Looks like someone copied your idea!

71Eb8g6HLOL._CR211,0,1218,1218_UX175.jpg


7125rF3TA0L._CR412,0,1060,1060_UX175.jpg


https://www.amazon.com/DROK-Fahrenh...eter-Electronic/dp/B00E7OHM2O#customerReviews - look at the customer pics here on amazon. Might be easier for others to do if they wanna replace the clock....
 

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