n5i6 is the error code for 'No Signal'. Look first at the tach probe and wires, these are easily damaged.
Here is a link to the manual for the tach pictured.
www.lormfg.com/sites/default/files/MANUAL_rev7_%28Pr7%29.pdf
You can call LOR Mfg for troubleshooting help.
The part numbers...
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