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Sounds like you have a bad ground
Appling power to the lights on the tach should have no impact on the tach reading, if it does I think you have a bad ground going to the tach.
There is a special fuse on the fuse block for the instrument lamps that is powered from the light switch, I believe it has a 5 amp fuse, you should be able to connect either to the gray wire as Swervin indicated or to the fuse block.
Hope this helps.
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Dave M. (Hacksaw)
86 C10 Scottsdale LWB, 4.3L, Edelbrock 1904, K&N, 700R4, 3.08 Auburn Performance
89 GMC S-15 Extended Cab 4x4, 4.3L, FI
98 K1500 Xcab, 5.7L, 3.43 Gov-Lok
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