HI Chris,
I have the same problem in the guage needles half dead (Speedo/Tachometer). I have a complete dark panel before, I replaced few EC's on the PSU boards. Everthing went back to normal except to those two needles. I think I need to go further EC's replacement to fix the problem completely. I am afraid to replace the needle may not slove the problem, since the needle is supplied by high voltage, it may not have enough juice to power up those needles.
If anyone know more about this problem, please share.
Thanks.