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Progress report. Seems I was one measurement shy of a load when I researched my LEDs. (Amazon, SIGANDG 10 Pieces 194 LED Bulb White DC12V 6500k 120LM COB LED Replacement Bulbs,168 LED bulb,2825 194 T10 W5W LED - $6) I checked the base width, but not the base thickness. Turns out the "plastic" LEDs' base thickness is greater than that of the glass incandescents. So, in order to fit them into the existing holders, you have to widen the contact considerably with a flatblade screwdriver. And, as suggested, make sure you have the polarity correct as the ground is accomplished through the holder's contact with the instrument.
Meantime, I tested the $2.79 dimmer (https://www.ebay.com/itm/123822658760) on a single LED, using one of the $7.99 for 10, 10mm dia. sockets with pigtails (https://www.ebay.com/itm/123822658760), and it worked perfectly. The seller agreed, however, that the grounds will have to come through the same side of the dimmer that the power exits.
So now I have the four undimmed bulbs replaced in the speedo and tach and, in the garage, at night, it is incredible. Nice, slightly greenish glow and Wow! I can actually see everything clearly.
I'm stopping at this point because I want to drive the car at night to insure that these lights aren't too bright and cause my aged-night-vision eyes problems. That will have to wait until the current snow and attendant salt are washed away by a good rain. If so, i'm going to have to build a completely new wiring harness, incorporating the dimmer, using the sockets.
Meantime, can anyone tell me how the hell to get at the bulbs in those two temp gauges between the tach and speedo? Seems almost impossible.
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