2Driver
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I am going to say that wire is not for the tach. On the newer Merc stuff the tach comes out of the main harness the same as the other gauges from the PCM
With that I am about out of knowledge. :rolleyes
There should be a grey wire in your harness. If you are running a coil, it should connect to the coil after the point where the harness plugs in.
Does it have a coil or individual coil packs for each cylinder?
If it has a coil, run a wire from the negative side if the coil to the tach temporarily over the interior. If the tach works, then either run a new wire along the harness, or start by bypassing the connections and or plugs in the harness.
What ignition system ?, some tachs an some systems are not compatible also if the tach has a dip switch on the back where is it set ?Well any fresh ideas?
I took the boat to Prestige marine and they said the tach was getting a signal and power and to replace the tach. I bought a brand new Faria ( same as stock) installed it and nothing
Same thing. Hour displays and it lights but hours don't move and needle doesn't budge.
What ignition system ?, some tachs an some systems are not compatible also if the tach has a dip switch on the back where is it set ?