Volvo Tach stuck

[Tezza79]

Just hoping for some advice.
The needle on my port tach has stuck at 3800rpm whilst hitting a rather large wake at speed.
They are the older style tach with the digital hour meter running with KAD 42s.
Ive tried tapping the face and disconnected the wires but its still stuck there.

Does anyone know of a fix I could try or do I need to replace it?

TAI
Terry

 

[Clash]

Just hoping for some advice.
The needle on my port tach has stuck at 3800rpm whilst hitting a rather large wake at speed.
They are the older style tach with the digital hour meter running with KAD 42s.
Ive tried tapping the face and disconnected the wires but its still stuck there.

Does anyone know of a fix I could try or do I need to replace it?

TAI
Terry

Maybe a magnet would work?

But it could be any number of things. Have you checked fuses?

 

[New Boater]

Very straight forward to take apart and have a look inside!

My Hour readings were dead on both of mine so I replaced the little LCD’s and they came right back.

Very very happy about that as they read less than I was told when I bought it!!!

I would check connections at the back first though!

 

[vas]

I would check connections at the back first though!

agree!

loss of power (12VDC or 24VDC) will exhibit the same behaviour: dead on the spot.

So check they do get some juice first (assuming it's now completely dead and not illumination or even the digital hour meter works!)

 

[Rocksteadee]

Need a bigger hammer

 

[oldgit]

In the dim and distant past have replaced the hours meter on a VP tacho with a kit from ebay.
From memory nothing too complicated regards dismantling tacho on the bench ......once you have removed it from dashboard.
Possibly need a set of jewellers screwdrivers and gently dislodge needle ?

Replacements eye wateringly new from VP and replacing with aftermarket cheapy not always straight forward due to where signal is picked up ie. sensor on gearbox and not alternator.
Have freed off recalcitrant needle on Yanmar tacho before , fix never lasted long and eventually replaced with pair of budget KUS.
Original Yanmar tachos picked up signal from a gearbox sensor , KUS replacements picked up from alternator, new wire(s) required to be run throughout boat

 

[PaulRainbow]

In the dim and distant past have replaced the hours meter on a VP tacho with a kit from ebay.
From memory nothing too complicated regards dismantling tacho on the bench ......once you have removed it from dashboard.
Possibly need a set of jewellers screwdrivers and gently dislodge needle ?

Replacements eye wateringly new from VP and replacing with aftermarket cheapy not always straight forward due to where signal is picked up ie. sensor on gearbox and not alternator.
Have freed off recalcitrant needle on Yanmar tacho before , fix never lasted long and eventually replaced with pair of budget KUS.
Original Yanmar tachos picked up signal from a gearbox sensor , KUS replacements picked up from alternator, new wire(s) required to be run throughout boat

No need to run new wires, just connect the signal wire from the sensor to the alternator.

 

[oldgit]

No need to run new wires, just connect the signal wire from the sensor to the alternator.

Both tachos on the flybridge replaced with KUS , requiring new wiring to pick up pulse from alternators.

The Yanmar tachos in the helm downstairs still needed a pulse from the existing wiring from gearbox sensors. ?
Both sets agree regards displayed RPM

 

[PaulRainbow]

Both tachos on the flybridge replaced with KUS , requiring new wiring to pick up pulse from alternators.

The Yanmar tachos in the helm downstairs still needed a pulse from the existing wiring from gearbox sensors. ?
Both sets agree regards displayed RPM

Ah, you didn't say you only changed one set

 

[oldgit]

Only kept jamming but bought a matching KUS pair from ebay.
UK chandleries had KUS stock but wanted another £30.00 each plus postage.
Yanmar was asking a very reasonable £300.00 for a unit with no hours log.

Had to expand the hole a few mm as the Yanmar was slightly smaller .
Easy to calibrate and still working OK after 100 hours or so.