Mine used to do that. It is possible that you may need to pull the gauge cluster out and disconnect the speedo cable and put some grease on the cable itself. It helps. If that doesn't work but it goes away and then comes back you may need a new speedometer cable. I have a new cable and I don't have the squeek anymore. If it's not that then I don't have any idea how to help. Sorry and good luck.
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Black 1990 LX DSS Racing Super Pro Bullit 331, AFR 185, Anderson B31 Cam, 1.6 DSS rockers, Cobra Intake w/ 2 phenolic spacer, Aluminum DS, 3.73 gears, Tremec 3550, Lakewood SFI Bellhousing, MSD Digital 6+, Spintech Side Exhaust,
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