Okay, the tach light malfunction was probably due to it being very cold that night, I have noticed that when it is near or below freezing here, my radar detector will not come on when I crank up the car, (hard wired), once the interior warms up, it springs to life. I am going to assume that this was the same problem with the tach light also, maybe had a little condensation in the instrument panel or something, never happened before and hasn't happened since. Now that - that has been explained......on to the rest of the story...
I posted way back when about a wierd problem I had when I moved a coil around, it was determined to be RF interference. The problem was that upon accelleration, the car would act as if it was on the rev limiter, wouldn't shift, and a loss of power. Well, the other day, before I noticed the broken strap, it did it again, twice, when the car was cold. It hasn't occured since but I wonder if this had to do with the broken strap?