Boat tachometer hook up

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Automobile Tachometer on an Outboard

The vast majority of recreational boats in service today are still using analogue instrumentation systems. More modern digital, NMEA-networked, and multifunction gauges may be all the buzz, but the reality is that most boats are still equipped with the same analogue set-ups that have been in use for decades. The insides of instrument panels can get a little crowded, but untangling it is all a matter of circuits, senders, and wire colors.

Doug Logan photo. I recently provided an answer to a visitor's question on boats. I thought it would be a good idea to expand on that subject a bit more in a bigger article. I hope this information will help you sort out issues you may have with your engine instrumentation. Engine instruments can get broken down into three broad categories for the purpose of troubleshooting. Most analogue gauges used for the purpose of determining fuel level, engine temperature, and oil pressure fall into one category that utilize a variable resistor sensor mounted on the engine to provide you with a reading on your gauge.

A second gauge group consists of voltmeters and ammeters, and they work a bit differently. With older gauges, an ammeter will typically get connected up via what we call a shunt in a series electrical connection. Voltmeters will often be found instead of or in addition to ammeters. These get connected in parallel with one DC positive wire and one DC negative wire supplying power to the gauge and enabling a voltage measurement.

Finally, the third category of instrument we need to look at briefly is the engine tachometer. Tachometers are somewhat unique when it comes to the electrical connections to them. Besides the electrical connection points on the gauges, the ABYC has for many years had some recommended color codes for the various wires coming from the engine mounted sending units and fuel tank level gauge, as well as the DC positive and ground conductors involved.

Not all, but many of the engine manufacturers follow these color recommendations. Figure 1. Tachometer terminals. Back Explore View All. Back Types View All. Unpowered Boats Kayaks Dinghies. Personal Watercraft Personal Watercraft. Back Research. Reviews Boats Engines and Parts. How-to Maintenance Buying and Selling Seamanship. Boats PWCs. Boats for Sale View All. Or select country. Search Advanced Search.

Personal Watercraft for Sale View All. Figure 2. Variable resistor activated gauge. Liked it? Share it! Facebook Twitter. Bonefish Made Easy Chris Dummit. Boat Reviews. Boating Guides. Boat Buyer's Guide. Boat Seller's Guide. How to Buy a Boat: Tips for a First Time Buyer. Spring Commissioning for Your Boat. Popular Articles Related Articles 1. Five Affordable Trawlers Under 40 Feet. What Hull Shape is Best? Best Boat Brands. What Type is Right for You?

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In this video I install a tachometer in my boat. I wire up the power and then select the number of pulses or cycles my outboard has to get the correct reading. simplify the hook-up. 7. Connect a wire to the tach stud marked “GND” (ground) and secure with a nut and lockwasher. Connect opposite end to the boat's.

You've probably clicked on this link to tell me that you can't do it. My motor has a 12 pole stator, creating 6 pulses per revolution. Check with your local dealer. Unlike outboards, which run off of the stator, Automobile tachs run of the distributor on older vehicles.

The tach on your boat gives you a better view of your engine's performance. If your boat does not already have a tachometer installed, you're only getting a partial picture of your boat's performance.

You've probably clicked on this link to tell me that you can't do it. My motor has a 12 pole stator, creating 6 pulses per revolution. Check with your local dealer.

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These installation instructions contain information that can help prevent personal injury and damage to equipment. Understand the following symbols before proceeding:. Safety Warning: Alerts you to the possibility of danger and identifies information that will help prevent injuries. Appears next to information that controls correct assembly and operation of the product.

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The vast majority of recreational boats in service today are still using analogue instrumentation systems. More modern digital, NMEA-networked, and multifunction gauges may be all the buzz, but the reality is that most boats are still equipped with the same analogue set-ups that have been in use for decades. The insides of instrument panels can get a little crowded, but untangling it is all a matter of circuits, senders, and wire colors.

INSTALLATION INSTRUCTIONS Tachometer Kit

You've probably clicked on this link to tell me that you can't do it. My motor has a 12 pole stator, creating 6 pulses per revolution. Check with your local dealer. Unlike outboards, which run off of the stator, Automobile tachs run of the distributor on older vehicles. On automobiles, 4 cylinders send 2 pulses, 6 cylinders send 3 pulses, and 8 cylinders send 4 pulses per rotation. I disassembled the tach, by removing 2 screw from the back and poping off the front beezel with a flat head screwdriver. That being said I replaced the 10 cent resistor for the 6 cylinder position to k ohms 2 resistors, 1- 47K and 1- K causing the gauge to read 6 pulses a revolution, and giving me an accurate gauge reading. I hope this is helpful and if you have any question let me know. Let me know what you think. Question 12 months ago on Step 3. Yes, I took my tach apart and it does not have a resistor like the one in your photo.

Automobile Tachometer on an Outboard

Discussion in ' Outboards ' started by Dave T , Sep 17, Log in or Sign up. Boat Design Net. Sep Posts: I bought a 70 horse Mercury outboard and I want to add a tachometer so I can better monitor it's performance. The control has 3 wires that exit the front of the control that have been cut off a red, black and white I'm not sure if these are for a tach or not. Can anybody tell me what I need to do to connect a tach to this motor?

Automobile Tachometer on an Outboard

Boats with tachometers allow the boat owner to govern and moderate the engine's rpm rate during wide-open throttle operation. Yellow and red lines on the tachometer indicate caution and danger thresholds, warning the boat owner of engine speeds exceeding the manufacture's specifications. Keeping the engine within and under maximum rpm ratings extends engine life and promotes better performance. Trailer the boat to a convenient work location. Use a socket to disconnect the negative battery cable. Remove the key or lanyard from the ignition. Open the tachometer kit, and lay out the pieces.

Ignition Box If you have an ignition box i. If you have a 5V Tachometer signal you can: Install a ohm "pull up" resister from the 12V gauge power source ACC to the signal wire to increase the signal strength. Contact us to special order a tachometer that will work with the 5V ECU signal. Due to the high voltage of the signal from the HEI you should use a tachometer filter to prevent damage to the tachometer.

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Johnson Outboard Marine Motor Tachometer / Hour Meter Install
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