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Changed mine to a brand new one $$. Made zero difference on the gauge. My problem must be somewhere else.
try cleaning the grounds for the instrument cluster - for 85.5+ cars, there a whole bunch of brown ground wires terminating under the dashtop just about above the driver's left knee. Just remove the 10MM bolt, clean off the lugs with a little sandpaper and re-install. See the post https://rennlist.com/forums/924-931-944-951-968-forum/375422-cleaning-grounds.html for a ground wire schematic. Worth cleaning those ground points.