HELP: Looking for Rev/Shifter Lights for T500RS (or any wheels without shift lights)

I'm looking for a cheap rev/shifter light solution so that I can mount in onto my T500RS. Preferably around than USD$50 and very low profile something similar to the ones like on G27 wheel etc.

Something as simple and smaller hardware profile like this combination (even without the 4 digit rev display but only the lights):

Preliminary research, I source the main parts below which is all for Arduino. Arduino programs are pretty easy to find and tweak. However, I have no industrial design/3D printing knowledge to house the everything put together that will fit nicely for T500RS. That's why I was hoping the someone might have an alternative peripheral on the market that fits. One such DIY

Adafruit Pro Trinket - 5V 16MHz ($9.95) OR Arduino Micro with Headers - 5V 16MHz - (ATmega32u4 - assembled) ($24.95)

NeoPixel Stick - 8 x WS2812 5050 RGB LED with Integrated Drivers ($5.95) OR Bi-Color (Red/Green) 24-Bar Bargraph w/I2C Backpack Kit ($9.95)


Adafruit 0.56" 4-Digit 7-Segment Display w/I2C Backpack - Blue ($11.95)

PS. I original posted on ISRTV but no response.

Update (7 March 2016)

Found a really comprehensive one:
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United States
United States
Another simple solution is one of the many excellent apps? I just downloaded an app for PCARS so I can run a Motec display on a cheapo $50 tablet. I understand you're looking for something really minimalist though.