You probably have a faulty connection on the battery feed wire to the dash/instruments or dash and instrumentation grounding.
As the directional signals draw current thru the wiring, a poor connection will cause a voltage drop, so anything connected on the directional side of that power feed will see tha drop and dance with it.
George
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"...out to my ol'55, I pulled away slowly, feeling so holy, god knows i was feeling alive"....written by Tom Wait from the Eagles' Live From The Forum
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