Yamaha FMM connection to speed input

[Cobe Hunter]

hi,
I have a Fuel Management Meter (FMM) and I need to connect speed input so that it can compute fuel efficiency.

I understand there are two options and I need to purchase one of the two optional leads for this.

Option 1 - buy lead 6Y5-87122-S0-00 which is the connection to the speedo and is fairly cheap, or;

Option 2 - buy lead 6Y5-85721-F0 which is the connection to the GPS and is about 4 times the cost of option 1.

I realise the speedo is based on the engine pickup and therefore not quite as accurate as gps and I can live with that but is there any other reason to go for GPS speed input? Also I have a lowrance LMS 525 gps, Would this connection be a problem? I think I would need to find the NMEA output wire for the GPS?

If I go with the speedo option, I am guessing the plugs just connect straight to the yamaha speedo gauge.

Thanks in advance for any assistance.

[boats.net]

Speedo connection is the easy way, just plug it in and set dip switch in gauge as long as speedo is working.

[Cobe Hunter]

Thanks for the advice. Yes I will buy the speedo cable then. Can I purchase from here and get it sent to an address in Australia?
Thanks

[boats.net]

Yes you can place order here online and them shipped to you.