1
MAN #650519:B
GPS-50-2
GPS Speed and Bus Interface Module
B
A
T
T
E
R
Y
G
R
O
U
N
D
B
IM
I
/O
S
P
E
E
D
2
A
C
C
P
W
R
S
P
E
E
D
1
www.dakotadigital.com
605-332-6513
GPS-50-2
GPS INTERFACE
C
R
U
IS
E
T
E
M
P
+
T
E
M
P
-
OPTIONAL
ANTENNA
+12V
KEY ON POWER
(fused 5 - 20 AMP max)
BIM-xx-2 6 foot power/data harness
BIM-xx-1 adapter harness
Connect to
BIM-xx-2
power/data
harness
if needed
Connect to
GPS-50-2
BLACK WIRE
RED WIRE
Connect to main
chassis ground
To gauge control box
or BIM-xx-1
Connect directly to another BIM-xx-2
or to the BIM-xx-1 adapter harness
R
E
D
W
IR
E
B
L
A
C
K
W
IR
E
Mount the outside
air temperature
sensor in the front
grill area or another
location that can get
good air flow while
the vehicle is being
driven.
+12V
CONSTANT BATTERY POWER
(fused 5 - 20 AMP max)
B
A
T
T
E
R
Y
G
R
O
U
N
D
B
IM
I
/O
S
P
E
E
D
2
A
C
C
P
W
R
S
P
E
E
D
1
www.dakotadigital.com
605-332-6513
GPS-50-2
GPS INTERFACE
C
R
U
IS
E
T
E
M
P
+
T
E
M
P
-
OPTIONAL
ANTENNA
Connect to main
chassis ground
+12V
CONSTANT BATTERY POWER
(fused 5 - 20 AMP max)
+12V
KEY ON POWER
(fused 5 - 20 AMP max)
AC speedometer output.
Standard speedometer output.
Cruise control speed output.
BIM-xx-2
Power
& data
connectors
Accessory power and
ground provided by BIM
power/data harness.
Connection to Dakota
Digital gauge system.
Connection for GPS
speed signal to other
electric speedometers.
optional speed and
cruise control outputs.
setup/status switch
setup/status switch
optional SEN-15
This Bus Interface Module can be used to provide an accurate speedometer signal with most manufacturers’ gauges and
also with a Dakota Digital system to provide speed, compass with air temp, clock, and altimeter functions. There are two
speedometer outputs to work with standard speedometers and a dedicated cruise control output. There are two interface
(I/O) ports on the module for use with a Dakota Digital gauge system. Either one can be connected to the gauge system
or to another module, allowing several units to be daisy chained together. Do not connect the I/O port to anything other
than a Dakota Digital gauge or BIM. Do not mount the module in the engine compartment; it should be mounted in interior
of the vehicle. Make sure the module is securely mounted and not hanging loose. It uses an internal acceleration
sensor which cannot accurately track the vehicle acceleration if it is loose.
The speed data does not use one of the 16 available bus ID’s like other Dakota Digital BIM units do. Speed data is
transmitted and updated every 0.1 second. The remaining data is sent one at a time in sequence along with any other
BIM modules present on the system.
The optional SEN-15 outside air temperature sensor can be connected when a Dakota Digital gauge system is connected
to provide a combination compass & air temperature readings together.
The GPS speed signal can be momentarily incorrect due to interference from overpasses, tunnels, and nearby structures.
To avoid this problem, the system stabilizes the speedometer reading by constantly comparing it with an internal
acceleration sensor. When the key is off, the system goes into a very low power standby mode and only occasionally
wakes up to update GPS readings so that it is ready to start operating as soon as the key is turned on.
The GPS-50-2 has an internal GPS antenna to directly receive GPS signals without the need for an external antenna. An
external antenna can optionally be added to enhance reception if the GPS-50-2 is mounted where GPS signals cannot
reach it. Contact Dakota Digital for part number and availability.
IMPORTANT NOTE!
When used to operate a cruise control, see the special
mounting requirements on the bottom of page 6.
