Well, are the gauge bodies (including the speedo) grounded?
I'm not sure of the arrangement on a 4A, but on the earlier TRs there should
be a ground harness that runs over to the tach & speedo. The small gauges
did not originally have separate grounds, but I advocate adding one for the
fuel gauge (which on the earlier cars is the only one that needs a ground).
The grounding through the mounting is just not very secure.
-- Randall
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