I have a 1978 el camino and the speedometer doesnt work. Ive disconnected the cable from the transmission and i can spin it by hand and it moves. That cable is good. under the hood on the driver side theres the cruise unit where the transmission cable goes in and theres another cable that goes inside and connects to the speedomter. Well when i turn the other cable the speedometer moves so im thinking its that unit but i dont know what its called :?: Could someone help any input would be helpful :evil: !!!!!!!!!!!!