HI! I'm new to the forum though I have read many post on here, I'm experiencing a odd issue, and any help is appreciated! My speedo works fine when I start driving, after 10 min on the road, the speedo gradually drops to 0 with the car moving normal speed. If I stop and let the car cool off, it will work again for another 10 min. It happens like clockwork every time I drive it, works fine for about 10 min. Also it knocks out the OD, and or cruise control when it drops off! and sometimes I get a CEL (not always) code 24(VSS). Gage cluster was rebuild not long ago, no change in issue, Tried a cluster out of another car...No change! also replaced the VSS...No change! Car is a 1988 with the DNE 4+3 engine rebuilt to +.30 mild cam, intake and exhaust mods, drivetrain stock.
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