I've got a 92 d250 ctd(intercooled) with a get rag 5 speed. Bone stock, my problem is speedo works once in a while. But bounces when it does!it even registers sitting still on a cold startup! I've replaced the electronic speed sensor and rewired up to the cruise assy.anyone have any ideas? Than in advance

 

how many miles? mine did that around 200k before it quit, new gears fixed that, posted fix in sticky