Is it possible that a fusible link is causing my tach to jump then all power turn off? I can't find a short and the problem doesn't stick around long enough to find the source. Tim Burgess suggested that a fusible link can work its way loose from inside.
Anyone experience this?

 

A friend of mine with an '84 Z had about the same problem until his link burned up completely. So, yes, a fuseable link can cause intermittant "power outages" to the engine in a car.

 

Thanks morley. I am going to replace all of them asap. I hope this is the cause of the jumpy tach nonesense.
I love being able to fix my car with the internet.
Much respect thirdgen.