my sunpro tach has 4 wires. red to hot,blk to grd,wht to light and green to - coil. all this is done and correct. tach doesnt work ,doesnt quiver.i have an accell ign. box. seems ive heard this green wire would need to go elsewhere with this box. im not sure thats the case or where. i see no place on this closed box for a tach wire. any idea on this, thanks.