Help me hooking up my tacho please!

[y2jericho]

I have a tach connector on my mercontrol <br /><br />And it has 1 plug in it which is the tach sensor and the other 2 are postive and negative for use with console stuff that needs electricity. My Tacho is a Stewart Warner (SW) tacho which just has a red bolt and nut and black bolt and not on the back how do i hook it up to the tach connector like where do i put the tach sensor cable. <br /><br />Also do you tihnk a 4.4m runabout (de hallivand 1974) with a 65hp Mercury thunderbolt 1970 motor could pull a water skiier?<br /><br />Thanks

 

[Bob_VT]

Re: Help me hooking up my tacho please!

Sounds as if you have a tachometer designed for an inboard/outboard. I am not sure you can convert one to an outboard tachometer.<br /><br />Youe boat might pull a skier...just try it. People do ski with less power.<br /><br />Bob

 

[Capt. Bob]

Re: Help me hooking up my tacho please!

I can pull a skier on my 15' with a 65hp Evinrude. You may have to change the prop to a lower pitch and even add a foil but you can make it work.

 

[y2jericho]

Re: Help me hooking up my tacho please!

i got a hydra foil on this mofo <br /><br />So what i have is an inboard/outboard tacho? Do outboard tachos only use 1 cable? <br /><br />Maybe i can hotwire it somehow directly to the engine?<br /><br />Any help thanks

 

[y2jericho]

Re: Help me hooking up my tacho please!

i got a hydra foil on this mofo and by changing it to a lower pitch prop.. You mean a prop with shorter fins? And what exactly does tihs do does it make it speed up faster but lower top speed or something?<br /><br />Thanks<br /><br />So what i have is an inboard/outboard tacho? Do outboard tachos only use 1 cable? <br /><br />Maybe i can hotwire it somehow directly to the engine?<br /><br />Any help thanks

 

[rickdb1boat]

Re: Help me hooking up my tacho please!

The pitch of the Prop is the angle of the Blades. They are not shorter! Less angle means less pitch and the prop will turn faster, thereby increasing RPM'S at take-off and at all other speeds. That relates to more thrust when you take off from a standstill, but can also lower your top speed, becauce the "flater" surface of the blades will not propel you as fast as a more curved surface, in the simplest terms I can think of! As for the Tach. I don't know if you are calling the "Wires" cables or what, but out of the control box, you will have one large cable with 3 wires inside it. One Ground, One Hot and the other goes to the rectifier or senser, coming from the Motor. On the Tach, you would connect 1 to Hot, 1 to Ground and the other to Sender. WHEW!

 

[rickdb1boat]

Re: Help me hooking up my tacho please!

Look here for more info on Props!<br /><br /> Props

 

[rickdb1boat]

Re: Help me hooking up my tacho please!

Look here for Tach. info!<br /><br /> Tach

 

[y2jericho]

Re: Help me hooking up my tacho please!

<br />

<br /><br />Thats how my tacho looks<br /><br />The guy i bought it off said just to connect one side to the rev output and the other one to earth and that is enough?<br /><br />I dunno if that will work

 

[rickdb1boat]

Re: Help me hooking up my tacho please!

That should work! Make sure the selector on the back is set to "1"!