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the tach does not work on my f previous owner installed new tach and said he could never get it to work i used a test light i have power to it but still doesnt work and it is wired right according to the wiring diagram anyone have any ideas
 

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It always used to be the sensors....fan speed, cylinder speed, ground speed and eng speed. Before buying all new sensors, you need to check continuity from the stachometer witch down to each sensor location when the switch is positioned for each location. It may wind up being the switch only or the switch and all four sensors and even some wiring issues.
 

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if you have a ohm meter check the resistance of the sensors. a good sensor should test about 400 ohms.
 
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