my instructions for my gauge has 0 mention of this at all. It does not even mention the ground. It may be that we are using 2 diff. gauges. Sorry about that as I left everything in the car and did I get the two gauges confused...XD...DB...LC....LM....can we get a few more 2 letter product names that are hooked up totally differently?
This is the exact #3. Mounting and Connecting the XD1, just realized this is probably the difference...
...worth mentioning if not to get the specific info out. This is on the 15 page XD-1_Manual_1.2.
"1 If not using a commercial gauge pod, cut at 52mm hole into the intended dash location.
2 Insert and mount the XD-1 and mount it with the included mounting bracket, leaving the XD-1 cables in the back accessible.
3. Connect the RED wire from the back of the XD-1 to a switched 12v source in your car. A switched 12v source goes on as soon as the ignition on the car is on or the engine runs. Make sure the connection is fused with at least a 2A fuse.
4. If connecting to a LM-1, connect the XD-1 to LM-1 cable to the LM-1's serial port. Plug the 2.5mm male stereo end into the XD-1 serial IN port (female 2.5mm socket marked "IN").
5. If connecting to an LC-1 or LMA-3, connect the male 2.5mm stereo to male 2.5 stereo cable between the Serial OUT port of the LC-1 or the Serial OUT of the LMA-3 to the Serial IN port of the XD-1.
6. If using a computer to datalog or download LM-1 data, connect the XD-1 to Computer cable between the Serial OUT prot of the XD-1 and teh computers serial port."