I took a look at the tach unit I have apart for a 1968. The wire that
comes from the printed circuit to the "Coil" terminal and then through
the case to the printed circuit is brown on my unit. There is a blue
wire (very dark, almost looks black) that comes from the printed
circuit board and hooks to the housing (must be a ground). Also,
according to my wiring diagram, the wire that comes from your coil ,
passes through the firewall bulkhead connector, and then goes thru the
harness to the printed circuit connector (on the back of the
tach/speedo housing) should be a 20 gauge brown wire.
You may just need to hook up the ground wire to get your tach working!
Hope this helps.
work. Upon removing the speedo/tach module, I found a blue wire soldered to the
printed circuit on the back of the module and coiled up, not connected to
anything. Is this the wire I need to connect to the coil to get a tach signal?
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