Alternator?
While driving today, my tach reading dropped to 0, but would jump intermittently. At the same time, the voltage reading dropped to about 9 volts, and stayed there. I'm assuming that it's the alternator that's Fubar, since it happened to me 2 years ago as well, but I thought I'd just touch base with all the gurus and see if it might be something else that I'm missing.
1997 Chevy K2500 E/C Auto - K & N Filter, 3" exhaust, no cat. Midas Flowmaster muffler, Kennedy ECM, Peninsular Diesel Marine upper intake manifold, 3-gauge 'B' Pillar gauge pod, Autometer Phantom gauges, Boost, EGT, and Tranny temp. Homemade air/air intercooler setup, with puller fan. Phazer Gear timing, Fluidampr harmonic balancer, 250,000 kms.
2009 25' Springdale 5th wheel trailer
1978 Z28 4sp Camaro (in middle of restoring it)
1963 Dodge 2 dr. Hdtp., Model 440 (will be a Max Wedge clone)
1979 GL1000 (Honda Goldwing)