Yamaha 75C - LCD Multi-Function Tachograph - No Trim / Oil / Temp

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Hi all,
Friend just bought a Zodiac with 2 x Yamaha 75c with the multi-function LCD tachograph.

On both Multi-function LCD tachographs....
RPM Works

Trim / Oil / Temp NOT working. Trim on fully down, no oil indicating, Temp is flashing.

We have checked connections, all seem fine. Checked 20A fuse on the engine - OK.

I disconnected one of the wiring connectors (There's 2 connectors and approx 4 bullet connectors going to teach Display) and the Trim showed full up, just as an aside while wiggling around with bits.

As this is on both engines, I can't help but feel that something was disconnected by the previous owner.

The only other thing I can think of, may not be related, is that the RIB has aftermarket controls, there is no 704 control box.

Any thoughts on where to start?

[Orwell boy]

suspect the two trim sensors are stuck and need wd40 and fiddle then tighten them up on their shaft,if you can imagine the finger actuators stick in the down indicated position ,then when you raise the engines the whole sensor turns on the mounting shaft so remains showing down

[Davie]

Perfect example of the dip switches in back of gauges are set for 4stroke engines and the wrong trim sender unit. Take the grommet out the back of each rev counter and flick the two dip switches to the right of the three to. the opposite of what they are at the moment. You need a tiny flat screwdriver to do the job.

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Originally Posted by Davie

Perfect example of the dip switches in back of gauges are set for 4stroke engines and the wrong trim sender unit. Take the grommet out the back of each rev counter and flick the two dip switches to the right of the three to. the opposite of what they are at the moment. You need a tiny flat screwdriver to do the job.

Wow, thanks a million for this info, will give it a try,

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Originally Posted by Orwell boy

suspect the two trim sensors are stuck and need wd40 and fiddle then tighten them up on their shaft,if you can imagine the finger actuators stick in the down indicated position ,then when you raise the engines the whole sensor turns on the mounting shaft so remains showing down

Many thanks - i'll try the other suggestion first and will also check out your suggestion if no joy.

[Orwell boy]

while on the subject anybody know how to tweak us speed and fuel gauge 2010/11 ,to get it into litres from us gallons or uk gallons ?? no grommit on back i dont think ,thanks

[alt]

You were both right! Wrong settings on the Tacho and the trim senders were stuck. We managed to free one, but the other is a right off, so going to replace one.

Now the search for the part.... it's the 2-wire sender.

[Orwell boy]

Originally Posted by alt

You were both right! Wrong settings on the Tacho and the trim senders were stuck. We managed to free one, but the other is a right off, so going to replace one.

Now the search for the part.... it's the 2-wire sender.

You might regret one being a right off when you price a new one up !!