How-to
2003 Ford Crown Victoria Tach Adapter Install
An Autometer 9117 tach adapter was wired into the ignition coil power feed of a 2003 Ford Crown Victoria to generate a tach signal. The signal wire was run through the firewall to a Marauder cluster.
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Step 1
Cut the red/green wire a few inches away from the connector, on the fender side. Connect the tach adapter red wire to the side of the cut wire that runs down into the engine harness, and the red/light green wire to the side that goes into the connector.
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Step 2
Run the gray tach feed wire through the firewall by way of the rubber plug and into the Marauder cluster. The second photo shows the hole the wiring was routed through.
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Step 3
Connect the adapter ground wire to a ground point on the body, as the photo shows.
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Step 4
Check the finished wiring at the adapter. The 9117 is designed to have the ignition coil power feed pass through it to generate the tach signal, so the upstream (fuse) side of the cut wire goes to the adapter ignition IN wire (R) and the downstream (ignition coils) side goes to the ignition OUT wire (R/LG).
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Step 5
Mount the adapter. The owner mounted it in the spot that would hold cruise control, because the car does not have cruise control and the owner never uses it. The photos end here with the adapter installed and the tach signal wired to the Marauder cluster.
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