Faria Tach Reads 1000 RPMs Higher. Please advise

[diver94]

Hi,
I have a 2003 Regal Comodore 2860 with twin Mercruiser 4.3MPI Bravo III. The boat has the original Faria tachs. My starboard tach reads 1000 RPMs higher than the port side one (at idle, it reads 2000 RPMS while the port tach reads 900 RPMs). Both engines runs fine at idle and on plane. You can clearly see that both engines run at the same idle RPM?just the starboard tach reading way higher.
Under load the starboard tach also reads aprox 1000 RPMS higher (on plane it reads 4500 while the port side reads 3500).
Please let me have your thoughts. I would prefer not to replace the tach because it also read the engine hours.
Thanks,
Lui

 

[diver94]

Faria Tach reading higher RPMs (aprox 1000 RPMs higher)

Hi,
I have a 2003 Regal Comodore 2860 with twin Mercruiser 4.3MPI Bravo III. The boat has the original Faria tachs. My starboard tach reads 1000 RPMs higher than the port side one (at idle, it reads 2000 RPMS while the port tach reads 900 RPMs). Both engines runs fine at idle and on plane. You can clearly see that both engines run at the same idle RPM?just the starboard tach reading way higher.
Under load the starboard tach also reads aprox 1000 RPMS higher (on plane it reads 4500 while the port side reads 3500).
Please let me have your thoughts. I would prefer not to replace the tach because it also read the engine hours.
Thanks,
Lui

 

[Scott Danforth]

could be as simple as the switch on the back of the tach is in the wrong location. however if the tach is bad, short of replacement, you can send them into places like the speedometer shop in milwaukee wisconsin or D&D speedometer in the twin cities or an instrument repair/restoration facility near you for repair. however replacing will most likely be the least expensive.

 

[jkust]

Tachs have a switch on the back depending on the cylinders on the engine....possibly the tach was replaced and the switch wasn't set for the correct cylinders.

 

[Rick Stephens]

I have seen cycling the switch a few times on the back returning the tach to correct range.

 

[alldodge]

Have another thread here with Scotts answer
http://forums.iboats.com/forum/boat...ria-tach-reads-1000-rpms-higher-please-advise

 

[Thalasso]

Access the back of the tachometer and you should find a small dial that says 4 - 6 - 8 etc. Spin the pointer a few times and then set it

 

[Scott Danforth]

Need to have a mod merge the threads together

 

[diver94]

Got it. THANK You all for your assistance!

 

[diver94]

Got it. I will try that this weekend. THANKS!

 

[jbcurt00]

Diver
Merged the 2 topics and left them here in the Mercruiser forum

Please dont start multiple topics about the same subject, or in multiple forums.

Thank you

 

[Bondo]

Ayuh,.... Sure reads funny now,.....

One thread, in one forum works Sooo much Better,......

 

[diver94]

Sorry, guys:facepalm:​ Nobody read my post on the other forum.
BTW, the trick worked! "I have seen cycling the switch a few times on the back returning the tach to correct range"
I just did that and now the tach now reads 900 RPMS.
THANKS!

 

[Rick Stephens]

Righteous.