RVI Tacho not working

My tacho has given up recently. The wiring diagram in the manual indicates a feed from the +ve coil, and it must be tapped into the wire that is connected to my coil and disappears into a rat's maze of inaccessible wiring in the bulkhead. Which connection does this go to on the tacho? I have tried a new wire on the coil +ve against both bullet connectors but still no reading on the tacho at all. The only other connections are earth and the tacho light. Any shedding of light much appreciated :)
 
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