3) Modification of LEDs
Scraped the top of the LEDs. If scraped off, light illuminated a large area.
 | |  |
Scrape | | You can see "before" and "after". | | |
| | |
4) Install LED into circuit board and wiring
Doiguchisan cut the circuit board and install LED into it.
And he used 3 LEDs per 1 board. And 2 boards will be installed into gauge.
(When you install LEDs, you need resistor also. Please see pic.)
| |  |
| | | |
5) Install LED assemblies into the illumination case
6) Test
If LEDs operate normally, install the illumination case into the gauge
| |  |
3. Gauge Rings
| | |
| | |
1) Parts
Doigushisan got this funnel. It is made from stainless. He modified it!
| |  |
2) Modify and install
He cut this funnel using sander. After that, he sanded down that section.

Image
Ring with brackets | | Installed |
 | |  |
Finished!

Installed! This pic is nighttime.

*******************************************************************************************
Thank you so much for the nice report, Doiguchisan !!
Your idea is very so nice! Please keep up the good work!