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General Category >> Rubber Side Down! >> Tack O Meter
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Message started by Routy on 06/13/12 at 05:09:07

Title: Tack O Meter
Post by Routy on 06/13/12 at 05:09:07

I wonder why this wouldn't work on our single cylinder.
Knowing that a tach counts engine rpm's, and not cylinders, just seems like it should work.
http://www.harborfreight.com/2-inch-led-lit-tachometer-98480.html?utm_medium=cse&utm_source=shopzilla&hft_adv=40014&mr:referralID=cf59a663-b54f-11e1-ac63-001b2166c2c0

Jog, now go back and mod your post ! :)

Title: Re: Tack O Meter
Post by Dave on 06/13/12 at 05:34:49

Well one reason it won't work on the Savage.....is that it does not have a case. You have to cut a hole and mount it flush in a dash or an instrument pod.

Another reason it won't work is that you connect it to the coil wire and then set the switch for 4, 6 or 8 cylinders. The product manual is obtainable from the link you provided. It counts pulses from the coil - but divides the number by 4,6 or 8 depending on where you set the switch.....the switch does not work for a 1 cylinder.

And lastly.......look at the Product reviews and it seems to a a problematic tach and doesn't last very long. Now put it outdoors on a vibrating single cylinder.......bet it doesn survive long.

Title: Re: Tack O Meter
Post by Cookie1247 on 06/13/12 at 05:37:30

A tachometer measures engine ignitions then converts them to rpms.
Notice that the Harbor Freight tach is set up for 4,6, and 8 cylinder engines. For a 4 cylinder engine. it will count four ignitions as one revolution. It will probably read 4X the correct rpms on your S40.
I bought a relatively inexpensive tach which works very well on my S40. Here is a link. http://www.jpcycles.com/product/5600076
You can get this tach even cheaper on EBay. It is very simple to wire and works perfectly..
Good luck! :)

Title: Re: Tack O Meter
Post by Routy on 06/13/12 at 06:49:41

Seems all tachs would pickup off the plug wire, then all tachs would work on everything,.....well, except if they fire more than once per rev.
I have a beautiful mount for a 2" tach already mounted that used to hold a vac gauge. I must find a 2" tach w/o a case that will work.

Title: Re: Tack O Meter
Post by clearush on 06/13/12 at 06:51:53

5C47484444401F1C2B0 wrote:

I just installed that but the white face version and it works really well and only took about 30 min to install with removing the seat and tank.

The Harbour Frieght one will work it wires up the same as the bike one I just installed.