Yamaha GPS Speed

[Pipster100]

Hi all,
The 6Y5 digital speedometer for my Yamaha F150 has never worked since I purchased the RIB. I cleaned the intake hole in the lower leg and checked that the tube was clear all the way to the gauge but still no improvement, I only ever get a max speed reading of about 5kts even when doing 40kts actual boat speed.

Today, I removed the gauge from the consul and put a new short length of tube onto the gauge, I started very gently blowing into the tube, but couldn't get any speed reading until blowing quite hard, the most I could manage was 12kts blowing hard as I could so I think sometime in the past it's been damaged.

My next thought was to switch to GPS speed, from what I can tell I need cable 6Y5-87112-S0-00 but can't find one in the UK, anyone any ideas where I might be able to purchase what I need?

Cheers all

[Orwell boy]

I wouldnt give up so easily ,from some distant memory i can remember doing same blow test as you ,i think the pressures reqired alot more than you think plus of course you cant blow very hard !!, if i remeber my next move may have been a regulated air line ,but i do remember i never bought a new one !!

[Orwell boy]

Try this ............5psi =20mph
11psi = 30mph
19psi =40mph
30psi =50mph
do,nt know how accurate but may help

[Pipster100]

Thanks Orwell Boy,
I'll give that a go tomorrow and see what result I get. Think I'll be on the water on Tuesday for the first run of this year, looking like a nice day again in Cornwall.

[Pipster100]

You were right Orwell Boy, I used a pump to put pressure in the line and got some good results so happy the gauge is working. The problem I think is in the line between the engine and gauge. The hole in the lower leg is clear so think maybe the tube has got squeezed somewhere.

[phantom 19]

You can cut the Sumitumo plug off the back of the speedo and bare the white wire - if you connect this white wire to NMEA0183 output then the speedo will display the gps speed.