Will the DRAC box work with a 4000ppm signal? I was told it had to be a 2000ppm signal. I am fixing to order one of the dakota digital signal conditioners to get my speedo working. but then again my DRAC is built into the cluster on my 91. I am runnign a nelson harness and am not sure. I can look on it and see what pin Nelson is useing for the speedo if you would like.