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 With the cluster completely...  With the cluster completely removed, here's what you can expect to see. For '67, there are three plugs-two multiplex and one duplex. For '68, Ford streamlined it to one large multiplex plug. Because this '68 Mustang has never been disturbed, everything is in its proper place.  The speedometer cable is gently...  The speedometer cable is gently pulled out from the engine side of the firewall. The firewall grommet should be replaced with the cable. Some speedometer cable kits already have this seal. If yours doesn't, you will need the #N8591 firewall seal.  To get underneath the car...  To get underneath the car to access the other end of the cable at the transmission, safely jack up and support the vehicle with jack stands. Never trust a bottle, scissor, or floor jack.  The speedometer cable is secured...  The speedometer cable is secured at the transmission with this retainer. You will need a 3/8-inch socket or box end wrench.  Inspect the drive gear for...  Inspect the drive gear for wear or damage.  Some applications use these...  Some applications use these chassis clips for cable retention while others employ a self-tapping screw and clamp. Chassis clips call for a common screwdriver to open the retainer. Insert and divide, which will release the clip.  The speedometer drive gear,...  The speedometer drive gear, retained with a clip, is moved from the old cable to the new.....  ....Lubricate the gear and...  ....Lubricate the gear and head with transmission fluid or engine assembly lube.  Because visibility is so poor...  Because visibility is so poor with hands in the way, we're showing you how the installed cabled should look at your firewall. The cable runs downward along the frame rail with the parking brake cable to the transmission crossmember.  Lubricate the speedometer...  Lubricate the speedometer head and cable tip with a lightweight lubricant and install. Hand tight will do the trick.  Reconnect and install the...  Reconnect and install the instrument cluster, checking lights and instruments for proper operation before reinstalling screws.  Chassis clips are reinstalled...  Chassis clips are reinstalled and crimped with pliers as shown. When you crimp the clip, it expands to fill the hole, which retains the clip.  Here's the speedometer cable...  Here's the speedometer cable properly installed. Watch cable routing carefully because it can get against a hot exhaust system if you're not careful.
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