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  1998 70HP Johnson 3 Cylinder Tachometer

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Author Topic:   1998 70HP Johnson 3 Cylinder Tachometer
Majestik posted 10-02-2010 08:57 PM ET (US)   Profile for Majestik   Send Email to Majestik  
Hi all,

I just got a 1978 Boston Whaler 15 Sport with a 1998 70HP Johnson Engine on it.
Unfortunately the boat came without any instruments, just the throttle and ignition controls, however there was a wire harness with several connectors.
I have identified the 8 pin connector as the connector for the System Check Tach (tech series) and i believe it is part number 176301.

I'm trying to find a compatible system check tach that will work for my engine/setup.

I was looking at three in particular:
1. OMC 176307 BOAT TACHOMETER GAUGE w/ SYSTEMS CHECK
2. TELEFLEX 58883F BOAT TACHOMETER w/SYSTEMS CHECK GAUGE
3. FARIA TCK002A OMC SYSTEMS CHECK BOAT TACHOMETER

I know the first choice is an original OMC with a different part number, but i don't know if it will work for my setup.
As for the other ones, i need some sort of confirmation if it will or will not be compatible with my setup.

Any help will be greatly appreciated.

:)

seahorse posted 10-03-2010 08:47 AM ET (US)     Profile for seahorse  Send Email to seahorse     
Any of the tachs made for System Check will work on your motor, or other OMC/BRP motors 1996 orlater.

The OMC tach number you posted has been superceded several times so that may be a older stock tachometer, not a recent one.

You will also need a warning horn to complete the system.

conch posted 10-03-2010 09:10 AM ET (US)     Profile for conch  Send Email to conch     
Also you might want to consider the Tachometer face divisions. I prefer a gauge in 100 rpm increments not 200 rpm.

Evinrude gauges come both styles, #177107 is an example of 100 rpm gauge face.

Easy to find and buy on the internet,maybe get the water pressure gauge and voltmeter too and combine shipping with the Tach.

Chuck

Majestik posted 10-03-2010 02:34 PM ET (US)     Profile for Majestik  Send Email to Majestik     
Thanks for the info.

I do appreciate your input and definitely made me at ease knowing that either one of these tachs with system checks will work.
I already have the wire harness with the 8 pin connector for the tach.
The harness also have other wires/connector on it that i would appreciate any help in identifying :)

= Connector with 2 pins
= 3 wires, Black, Gray and Purple (i think this is for a generic tach)
= 3 wires, Black, Purple, white w/gray line.

If anyone knows what these are or where i can find a schematic of the wire harness so i can match the colored wires, that would help allot.

seahorse posted 10-03-2010 03:09 PM ET (US)     Profile for seahorse  Send Email to seahorse     

The harness also have other wires/connector on it that i would appreciate any help in identifying :)

= Connector with 2 pins -- for warning horn assembly


= 3 wires, Black, Gray and Purple (i think this is for a generic tach) - you are right !


= 3 wires, Black, Purple, white w/gray line -- for trim gauge

Majestik posted 10-03-2010 04:10 PM ET (US)     Profile for Majestik  Send Email to Majestik     
seahorse,

Thanks a bunch, that helps ALLOT!!
I already ordered a System Check tach and a trim gauge.
I'm completely rebuilding the boat as it came with nothing but the engine, 2 thwart seats in a fair condition and a bimini top.
I'm modifying the seating positions and raising the seat height to make it more comfortable.
I'm also building a new helm console so the new gauges will look great and add value to the boat (not to mention peace of mind for me while operating).

As for the Warning Horn kit (2 pin connector), is that basically for a built in horn?
Any reference i find to the horn kit/assembly, just shows a female plug on a wire harness but i can't seem to see if it is also a horn (or trumpet) with a push button etc.. (part # 176361)

seahorse posted 10-03-2010 05:50 PM ET (US)     Profile for seahorse  Send Email to seahorse     
#176360 is the warning horn
Majestik posted 10-03-2010 06:04 PM ET (US)     Profile for Majestik  Send Email to Majestik     
Oh, i see...

this is not a "horn", this is a buzzer to alert you of an engine problem etc.. :)

Thanks, that makes sense and coincides with what i was seeing in pictures of the item for sale.

Thanks again for all the help :)

seahorse posted 10-04-2010 12:38 AM ET (US)     Profile for seahorse  Send Email to seahorse     
quote:

this is not a "horn", this is a buzzer


Popular vernacular as well as the factory call it a warning horn.


I say tomato, you say tomahto...

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