Popped the hood of my car this morning and discovered something I didn't find earlier. The rear driver's side spark plug wire was completely off. That's the clicking I heard, it was arching to the metal of the body thus leading to my bad ground causing the twitching speedometer. Put the wire back on and it works like a charm; smooth as ever.

 

HEHE, Gotta love it! You feel stupid when you do something like that , but also relieved that it wasn't something elusive or expensive . Glad to hear it was a simple mistake.

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'87 Silverado
350 4 bolt main bore .040 over
TB Injected
Ported and Polished heads
Comp cams 268h cam and top end
Flowtech headers
3.73s on Detroit locker

 

at least it wasnt a busted distro or something :P