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Hello everyone.
I had my 84 dash rebuilt and when I installed the rebuilt dash I found my speedometer is not registering the proper speed. Such as when traveling 55 mph it registers 35 mph.
If it worked properly before you had it repaired, then contact the company that repaired it and explain your problem. The speedometer receives pulses from a unit on the transmission and I think it very unlikely that it suddenly puts out about 1/2 the pulses.