You don't have to connect it to the coil.Under the driver's seat, they is a single slot which is used for timing by the mechanic, you can just connect it to it. As for power for the light, just go under the dash and spilt connect to one of the live wires.See link below at the picture section;http://autos.groups.yahoo.com/group/previa/
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.
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