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SN95 “jumpy” tachometer

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We have a 94 Mustang GT in the fleet as well as our other Mustangs.  I haven’t driven it a lot, maybe 200-300 miles since we bought it.  Due to some current circumstances I am driving it frequently at the moment.  Today I noticed the tach was jumpy.  On the freeway, it was bouncing up 500 rpm over where it should be.  The engine wasn’t revving or anything, just the tach needle.  The fuel gauge was also dropping about an 1/8 tank, then it would come up.  The other gauges were all fine the whole time.  5.0, 5 speed, 146k miles.  Has new plugs, wires, cap about 150 miles ago.  Any thoughts?

1931 Ford Model A Station Wagon
1969 Mach 1 - 351C, TKO-600, 4WDB, R&P, A/C, Shaker, Fold Down, etc.
1972 Mach 1 - 351C, FMX, PDB, PS, A/C, Fold Down, Console
1996 Mustang Cobra Convertible - 10psi Procharger, 436rwhp

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Bad ground?  Loose connection at the battery or fuse box?  You could also be losing your mind (if you find it, let me know because I lost mine some time ago and it might be hiding where yours is...)

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Let me check your shorts!




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