Sorry it took me so long to get back to you. We were off racing the car
. I don't have the extra black wire but I will try splicing the tach input wire to the gray wire going to the coil. I will let you know if that corrects the problem. Right now though I have to replace our upper oil cooler, remote oil filter, oil cooler fan, grill, one fender and possibly a couple of oil lines. We got caught up in a wreck caused by one young drivers impatience. He had already spun one car out of the way and I guess he decided that tactic was much easier than actually passing them. The result was four cars eliminated from the main event.
Oh well, I've been around the racin' game long enough to know that kind of driving will get you noticed, just not in a good way.
Thanks again for the info.