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How to Replace a Mazda B2600,B2200, B2000 Speedometer Gauge Cluster
November 1, 2012



Mazda B Series Speedometer Tachomter Gauge Cluster

If one of the components in your speedometer gauge cluster has failed, it is probably easier and less expensive to replace the whole cluster as an assembly rather than repairing your existing cluster.  With a simple phillips head screwdriver, you can remove and replace the speedometer in less than 10 minutes.

Getting Ready
Before installing your new tachometer, there are a couple things you'll want to check before you install it.  The first item to check is the drive where the speedometer cable plugs into the cluster.  You should be able to turn it easily with your finger or a small flat head screwdriver.  If it doesn't rotate freely, then the speedometer is jammed or bound up inside and will likely break your speedometer cable if you install it and operate it.

The other item to check is the light bulbs.  You'll want to check them before you install the cluster.  Most of these lights are only illuminated for a few seconds after engine start and will last for decades.  However, it's not uncommon for some owners to continue driving a truck long after a check engine light or EGR light has been illuminated; in some cases, for years.  In situations like this, there is a good chance that the bulbs will eventually burn out.  Since these little bulbs are the only way that your truck can tell you that certain things are wrong, you'll want to make sure they're in good working order in your new cluster.

The filaments in the bulbs are tiny and difficult to see with the naked eye.  If you can't visually see that the filaments are good, you can check them for continuity with a multi-meter.  Once you remove your old cluster, you can locate some good bulbs to replace any bad bulbs in your new cluster.

Ready to Remove and Replace
If your B-Series truck is stock height or a 4x4, you should be able to disconnect the cable from the transmission without jacking it up, although it may be a cozy fit.  If your truck is lowered, then you'll definitely need to gain some extra clearance underneath to gain access to the transmission.

1 Disconnect the Negative Battery Terminal

2 Remove the Trim Bezel
There are 4 screws to remove; two on the under side of the top and two on the underside of the bottom.  After those screws are out, give the bezel a gently tug and it will release the the fasteners that are still retaining it.  Don't pull to hard; the dimmer switch will still be plugged in.

3 Disconnect the Dimmer
Unplug the dimmer switch connector then set the bezel out of the way.

4 Release Cluster from the Dash
Remove the four screws holding the gauge cluster to the dash.  Now pull the cluster forward enough to gain access with one hand to the back of the cluster.

5 Give Yourself Some Slack
Locate the speedometer cable in the engine compartment.  Follow it down the firewall until you locate the retaining clip.  Carefully unsnap the cable from the clip.  Be careful as these plastic clips become brittle with age and can easily break.  Next, gently pull on the transmission end of the cable to take up some of the extra slack.  Push the slack through the grommet in the firewall and into the cabin.  Having the extra slack on the inside will make removing the gauge cluster easier.

6 Disconnect the wiring
Reach behind the cluster and unplug the three wiring harnesses on the back of the bezel by pushing the locking tab down and pulling away from the cluster.

7 Disconnect the Speedometer
Reaching behind the cluster again, grasp the end of the speedometer cable and depress the locking tab.  Then pull the cable out of the cluster and remove the cluster from the dash.

 

Installation
Installation is the reverse of removal.  However, there are a few important things to keep in mind. 

Changing From a Non-tachometer Cluster to a Tachometer Cluster
(and vice versa)
If you are changing from a cluster without a tachometer to one with a tachometer, you will need to reroute the end of the speedometer cable in the dash.  On your existing non-tach cluster, the speedometer input is in the center of the cluster.  On the new cluster with a tach, it is on the left side of the cluster.  In order make sure the cable doesn't get kinked, you will need to push the cable back through the center dash support frame and bring out of the left side left.  If you don't reroute it this way, you break the cable, the cluster, or both when you push the cluster back into the dash.  The reverse holds true if you are changing from a tach to a non-tack cluster.  In that case, you'll need to bring the cable through the center of the dash support frame.

Final Thoughts
Don't forget to replace any bad bulbs before you install the new cluster.  Also, after you are done installing the cluster, check to make sure the appropriate lights come on when you turn key on.  On most trucks, these will be the Check Engine, Oil Pressure, ABS, Charge, and Seat Belt lights.  If they don't come on, the you'll need to investigate why.