I have a 97 s10 with dis system.i know where to connect the ground(black),the power wire(red),and lighting wire(white),but the green wire(tach signal wire) is where i ran into trouble.which wire coming off of the 1/3 coil packs do i connect my tach signal wire to? diagrams would help alot!

 

well you might try e-mailing auto meter they helped me on my 85 s-10 http://www.autometer.com/tech_faq_an...d=3&qid=13