Tach Reading Off
 

Hi everyone. Just bought the pickup in my signature and the tach is reading super slow. Like 200rpms at idle and like 1250 at highway speed. All the other gauges work great. I cleaned the ess and checked the air gap and all was fine. any suggestions? It is charging so I know it is getting signal from the ess.






96 2500, 4x4 5spd 4.10s, All stock.

the electric motor behind it could be waek or the arm had fallen off and some one didnt get it correct when they put it back on......