Cool cheep speedo/tach

Rocketman,

Thanks for the write up. I have to agree with you on the appearance. I'm not certain I am impressed. Something not quite "pro" about it, can't put my finger on it. Although, for $100, it seems like a pretty decent do everything speedo.

I hope the seller takes the feedback and improves the product (at least the directions).

Scrap
 
Hopefully someone would be able to see this being that this threads a bit old. Hooking mine up right now and IM at a loss for this Tach wire. Wrap it around the coil? Like the insulated coil or... Any help would be awesome. Picture is worth 1000.
 
Likely it's inductive, so try wrapping it around a plug wire. It's the same way the Trailtech works and a couple other add on units....
 
I have a 1974 CB550. While working on this tonight I had a few questions I came across. I wired up the oil, neutral, brown power and high beam from the speedo unit to a quick connect. Then, on the bike/harness side, I had oil (blu/red), the neutral (light grn/red), the (what I thought was) tach light (brwn/white) and the brwn/red (that's what hooks to the high beam switch in diagram diagram). I have the grn from the unit connected to the grn ground of the bike. I also have the black power from the unit connected to the black of the bike.

If the ignition switch is turned on the first click, the unit powers on but without back lights. Once I switch the ignition to the second switch, the unit powers off... I tested the brwn/white and the black (which should power the unit) at the ignition switch. I read volts on the multimeter with it turned on the first switch but they went away once it was turned on to the second switch.

If I hard wire the power for the head light to the brown wire of the unit, the light will stay on. I think I read that that's what some of you are doing. PLease correct me if Im wrong.

Another weird thing was that I accidentally had it hooked up to the flasher relay, instead of the head light unit and the power came on on the second position and BLINKED on the first! Weird

Anyway... a little guidance would be helpful. Thanks.
 
Hahaha.....wow, you've been having some fun.
Yeah skip taking power from the switch itself...I've gotten some odd results that way myself.
Wire it to the headlight line (before the high/low switch) and you'll be golden.

As to the tach pickup. Yeah If I understand correctly just coil it around a plug wire that's convenient, no electrical connection. It's inductive so each plus sent to a plug creates a magnetic field around the wire that can be sensed. Clear as mud? haha
 
Thanks man. I ended up figuring out almost everything. The prob was I didnt have a headlight swtich when I should have. Found another set of controls I purchased that had that in there so I rewired and, voila! Works like a charm.

I have to extend the RPM wire to reach the spark plug. I heard 1st coil is the one to go to but I guess that doesnt matter? Is this a more accurate way of reading RPMs than an mechnical tach cable?
 
Good deal! As for more accurate...well, certainly the tach itself, being digital certainly has the potential to be more accurate and old mechanical gauges lose there 'oomph' after a while so yeah I'd bet it's a fair bit more accurate. I don't really think which plug wire you grab matters, I know it doesn't on my Vapor.....
 
How did you attach it? I read heat shrink insulating a sip tie and using that to wrap the wire around is the way to do it. I imagine the wire being about 1.5-2" in length and the zip covering that... pretty close?
 
I had enough lead to wrap around the plug lead...sheesh, probably 20 times. Kept is relatively tight and used some electrician's tape to hold it in place long enough to slip some shrink tube over it for permanent.

I'm about to do the same again on the 920, just waiting on my wire order and I'll get it installed. I'll take pics and post'm but it sounds like other than needing a little more length for your lead you're about dialed it.
 
Swagger said:
I had enough lead to wrap around the plug lead...sheesh, probably 20 times. Kept is relatively tight and used some electrician's tape to hold it in place long enough to slip some shrink tube over it for permanent.
Click to expand...

I just did this Exact thing last night with my acewell. Wrapped several times in a tight coil around the plug wire and then electrical tape etc. Lovely when these things light up isn't it?
 
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