Replacing Instrument Cluster bulbs with LEDs - Illumination Detail Question - 67 Barracuda

Years ago, I bought the ebay new circuit boards, built a small wire harness with a ground wire to each light/gauge, welded a stud to the firewall or dash, and grounded my new harness to that.
Replaced the bulbs with Sylvania or whatever I bought.
Not in your retina bright, but bright as I'll ever need.

Cleaned/painted the tail light housings, put in 3496 bulbs, have never replaced.
I use them for all tail lights, more $ than 1157 but none have ever gone out.

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