[Vwdiesel] 1982 mk1 instrument cluster LED specification and/or replacements

[ken1]

Does anyone know the specifications for the LEDs in the mk1 instrument cluster or what the proper reading should be when testing with a digital multimeter.
OR how to test the LEDs with cluster removed from vehicle?

I found the current generation LEDs with glow when polarity is correct and multimeter is used. 
When I measure the older generation LEDs, I get a reading on the meter.
I tried three (3) red ones and one (1) green one.
For the red ones, 1.508, 1.500, 1.468 respectively and the green one read 1.765. 
I guess the the power may not be enough for the older generation LEDs,
Any input? Thanks. 

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1982 caddy 1.6L NA running
1967 convertible bug running
1980 caddy project 
1991 2 door Jetta TD restoration in progress