HEI Distributor Tach issues, Issue has been resolved

The directions were very vague, the filter I bought is a Classics Instruments # CIN-SN20. The instruction on how to install it was printed on 2.5 X 2.5 piece of paper and hardly readable. It was just trial and error but now it works perfectly. The key was running the red wire from the filter directly to the negative side of the coil and the yellow signal wire from the filter to the green tach wire and black to ground. I didn't like the idea of running the filter under the hood with all the heat so I mounted it under the dash. The filter supposably has a 2% acracy