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**'68OrangeSunshine** · 09-12-2017, 10:32 PM

Tach wire is the one in the back [in this orientation]. The terminal we see in the ''front'' is/should be [BATT +] 12 VDC hot Ign "ON" wire from 12 volt source. I would crimp a new connector on the end to minimize intermittent contact.
In fact, if it was my truck I'd replace the blue line with a fresh 12 ga wire in red, add a Packard [locking] connector and run the feed end of the red line from IGN UNFUSED in the fuse block on the cab firewall.
You can get sets of ''Batt'' and ''Tach'' connectors, each with a color coded 12'' wire lead, for pretty cheap from Jegs or Summit. Red for BATT, Black or Brown for TACH. They slot right into the HEI cap and have extra tabs to prevent mis-connecting in the wrong slot. Jeg's p/n: 555-10552, $11.53.

09-12-2017, 10:32 PM	#16
'68OrangeSunshine Senior Member Join Date: Feb 2002 Location: Tucson, AZ USA Posts: 7,016	Re: HEI issues? Tach wire is the one in the back [in this orientation]. The terminal we see in the ''front'' is/should be [BATT +] 12 VDC hot Ign "ON" wire from 12 volt source. I would crimp a new connector on the end to minimize intermittent contact. In fact, if it was my truck I'd replace the blue line with a fresh 12 ga wire in red, add a Packard [locking] connector and run the feed end of the red line from IGN UNFUSED in the fuse block on the cab firewall. You can get sets of ''Batt'' and ''Tach'' connectors, each with a color coded 12'' wire lead, for pretty cheap from Jegs or Summit. Red for BATT, Black or Brown for TACH. They slot right into the HEI cap and have extra tabs to prevent mis-connecting in the wrong slot. Jeg's p/n: 555-10552, $11.53. __________________ Every 25 years I like to rebuild that 292, whether it needs it or not. Last edited by '68OrangeSunshine; 09-12-2017 at 10:49 PM.