Following up, in case anyone is interested...
These are the 194 LED replacements I bought, in warm white:
https://www.superbrightleds.com/mor...d-led-miniature-wedge-retrofit-car/3551/7576/
And these are the 1895 LED replacements that I bought, also in warm white:
https://www.superbrightleds.com/mor...-5-smd-led-tower-ba9s-retrofit-car/2077/4722/
Yesterday I got around to installing them. The 194's were drop-in replacements for the exterior marker lights. They don't seem any brighter than the incandescents they replaced, but they aren't any dimmer either, and they should last more or less forever.
Likewise the 1895 replacements went right into the Centech sockets in my harness. I replaced all the instrument cluster bulbs- 3 illumination bulbs plus turn signal and high beam bulbs. The LEDs are way brighter than the incandescent bulbs I took out, though I have to qualify that, since the incandescent bulbs were somewhat blackened from age. In any case, I can see the instrument cluster at night, and my old eyes can actually resolve what is being displayed now. And hopefully it will be a long time before I have to grovel under the panel to change bulbs again, because I sure don't enjoy that anymore.