Adding a speedometer cable to a Direct Plug

Adding a speedometer cable to a Direct Plug
Adding a speedometer cable to a
Direct Plug-In Cycle Analyst
Tools Needed:
1. Phillips head screwdriver
2. Speedometer cable
3. Direct Plug-In Cycle Analyst
4. Soldering Iron + Solder
1. Tweezers
2. Heatshrink
3. Silicone Rubber Sealant
First you need to open the Cycle Analyst by
unscrewing the 4 screws on the underside.
Once open you will notice a sealant that is
added during manufacturing to better protect
the Cycle Analyst from water ingress. Pull all
the sealant away from the enclosure and
dispose of it.
You’ll also notice that each screw has a rubber
grommet on the end. This holds the Cycle
Analyst firmly inside the enclosure. If you do
not fully remove the screws from the enclosure
these grommets will conveniently stay on the
end of the screw even after you have taken
apart the Cycle Analyst.
Adding a speedometer cable to a
Direct Plug-In Cycle Analyst
Once you have the Cycle Analyst
open you’ll notice the small circuit
board soldered to the LCD screen.
This is the Cycle Analyst circuit
The two pads on this board that we
need to pay attention to are “Sp” and
the “G” pad 3 spaces to the left of the
“Sp” pad. The “Sp” pad will already
have the yellow wire from the CA-DP
cable soldered to it. The first thing to
do is to desolder the yellow wire from
the circuit board. Be careful not to
damage the pad when removing the
wire by ensuring that the solder is fully
melted before tugging on the cable.
Note: earlier Cycle Analysts may have
a different board layout - the same
idea still applies: desolder the yellow
wire from the “Sp” pad and find a “G”
or “Gnd” pad on the board that you can
use for the other speedometer wire.
CA circuit board
Adding a speedometer cable to a
Direct Plug-In Cycle Analyst
Because the yellow wire is now loose
inside the Cycle Analyst it is a good
idea to trim it back so that it doesn’t
short against the circuit board.
Next you will want to insert the speedometer cable red wires into the back of the Cycle Analyst in the
bottom left spot as shown in the picture. Pull the cable through and then if you have some adhesive
heatshrink you can add it to the speedo cable to help with stress relief (if the speedometer cable is
unexpectedly tugged etc.) as shown in the pictures. This is not essential but if the speedometer
cable is pulled on it can help to prevent damage to the Cycle Analyst circuit board pads.
Adding a speedometer cable to a
Direct Plug-In Cycle Analyst
Now you can solder the two
speedometer cable wires to the circuit
board. It does not matter which way
round they go. Cycle Analysts after
version 2.3 have small holes that the
wires are threaded through to help
with strain relief - try to get the wire
through these holes if you can
(needlenose pliers help!) otherwise
just solder on top of the pads.
Close up the Cycle Analyst once
complete - be careful not to crush the
wires against the button ribbon cable or
to get a wire caught in the edge of the
enclosure and don’t forget the rubber
grommets. You can use a silicone
rubber adhesive sealant (such as
RTV100) to reseal the edge of the
enclosure box if you have some
The final step is to change the number
of poles in the advanced setup menu of
the Cycle Analyst to 1.
Congratulations - you have converted
your Direct Plug-In Cycle Analyst to use
a speedometer cable!
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