Submitted by Larry Abbot
I picked up a new tach from Performance Lightening for $75, a steal of a deal. It had one little flaw in the chrome that can hardly be seen. Since the Aero doesn't come with a tach I've always wanted one. Although the tach is large and designed for 1 1/4" bars, I adapted it to fit my 1" bars by using an old carb boot as a gasket between the tach and the handlebar.
There are 4 wires running from the tach:
Green - goes to the pulse side of the igniton coil (green coloured connector on the coil)
Red - to switched on power
Yellow - to lighting circuit
Black - to ground
I always run my wiring to the seat area of the bike, less hassle than going into the headlight assembly.
I used heat shrink on all the connections. I wired the ground the frame bolt by the seat, the green to the left side coil, and the red & yellow to the brown tailight wire. The junction is under the seat area
You can see the ground bolt in the top of the pic below.
I strongly suggest to put an inline fuse, which I did near the seat area. I have an inline fuse for the air horn, tach, voltmeter, and the lightbar . It may seem like overkill but they only cost a couple of bucks and worth it.
Once wired up I tested it, and it has a nice blue neon glow to the tach face and the tach needle is nice and steady, with no flucuation (so far!). After a test run I adjusted my idle as the tach indicated it was too high.
This website and it's contents are not affiliated with with Honda Motor Company, or any other group or organization. Performing the modifications listed within the website is done at your own risk. Developed and hosted by McLauthlin Technologies, LLC. Send questions, comments, or additions to