First off I am installing Autometer gauges, the speedo being GPS based.

Here's what I've got.......

Garmin wiring scematics...

Red: DC out
Blue: NMEA out
Yellow:Alarm Low
Black: Ground
Brown NMEA in

One Speedo harness..........
Red: +12v
White: Receiver antennae
Black: Ground

The other Speedo harness(light and recall).............
Black: Ground
White: Lamp
Red: +12v
Orange, Violet, Gray: monetary switch for recall


First I have a plug on the small speedo harness. Can I buy the female side of this plug or should I just cut it and put new connections on it? Sorry can't attach pics here.

Second....

I assume I connect the NMEA out from GPS to the white wire (antennae/receiver) in the small speedo harness? The other two in the small speedo are obvious.

I have noticed my GPS power is run off one ignition switch post, anyone have suggestions on a better constant power source?? GPS cuts off if it is on and I initiate that ignition switch.

seriously noone can help me out with this...... WTF???