How do you connect a tachometer to a 2001 S-10 with a 2.2L?
The green wire is supposed to go to the negative wire of the
coil , that is usually a white wire, but make sure that the
tachometer documents tell you to use the negative wire it is
usually the white wire. If you have a test light hook the cramp to
the negative of the battery and check the two wires if the light
glows that is the positive, connect the green wire to the other
wire it will be the negative. There are some that say to use the
positive, ""PLEASE READ THE INSTRUCTION VERY CAREFULLY"" Or you
could short out the coil and the igition module.