Digital Gauge Replacement with Analog Gauge

[johnawind]

Hello,​

I have just purchased an older Ranger 391V boat which has a Yamaha 150 Vpro outboard. Needles to say the rig needs a little TLC. I have had the engine gone through and its ready to go but the tach is not working so I do not want to run it too hard until I have a working tach.​

The boat has the original Yamaha digital Tach and Speedometer system, if I have to replace the Tach I would prefer the analog gauges (old school), so my question is;​

"What is required to convert the original gauges over to the new Pro Series II analog gauges."

Engine Year ; 1994​

Engine Model ; P150TLRS​

Engine Serial ; 6J9 L 355267​

Any help would be appreciated​

 

[QBhoy]

Yeah. It sure is. See link below, if you go the proper way, as an example.
other options out there too.

https://yamahaoutboards.com/en-us/home/rigging/all/gauges

 

[johnawind]

QBhoy,

thanks for the reply,

Yes those are the gauges I want to use, I can not find any useful information on the Yamaha site on how to convert from digital to analog. I'm sure its not a direct replacement, I have contacted two Yamaha distributors one said I needed a interface cable and the other did not know.

So before i spent money on new gauges, I need to determine the correct approach.

 

[QBhoy]

It’s the oil alarm I’d think needs thinking about. Must be something on the net about it.

 

[dingbat]

analog = voltage on a wire
digital = 0 and 1s over an Ethernet link

More than likely you’ll would need a D/A converter which isn’t going to be cheap, if you can find one at all.

Seeing lots of A/D converters to convert analog sensors to digital, but not the other way around

 

[alldodge]

They do make tach's that are digital and run off a buss but do display as an analog gauge.

 

[boscoe99]

The gauges that you have today are digital display. They are analog gauges. Just without the needle and dial.

No wiring changes are needed. The same motor outputs that drive your digital display gauges are one and the same that will drive analog gauges.

 

[johnawind]

Boscoe99,

I kinda agree, the problem is this is a multi function tach, it has a tach/water temp/oil level indicators and trim gauge in one unit.

At the least I would think there is some kind of break out cable required to split each one of the functions to separate gauges.

 

[boscoe99]

Boscoe99,

I kinda agree, the problem is this is a multi function tach, it has a tach/water temp/oil level indicators and trim gauge in one unit.

At the least I would think there is some kind of break out cable required to split each one of the functions to separate gauges.

The digital display gets inputs from two sources. The power, the ground and the tachometer signal come from a fused harness that connects to the key switch. The trim signal, the over temperature signal, the low oil caution signal and the low oil warning signal come from a separate harness that runs from the gauge to the motor.

The wires either connect to the digital display gauge or toe the needle and dial gauges.

 

[boscoe99]

Yamaha has already thought this out. Folks have been using either the digital display gauge or the analog gauges for several decades now.