I got my bike running last night, and the tach does not work as it should.  The owners manual and the Tech helper I emailed said the black tach wire should be grounded, and the red wire should go to the orange wire that is the power side of the coil (the other option is the black wire from the igniter).  The tach appears to have an accurate reading at idle - but as you open the throttle and the rpm's increase....the tach reading drops and goes to zero almost immediately.

How have you other Vapor owners wired your tach?

Goto RadioShack and get some resistors that will total 600K ohms and solder those inline somewhere in the red wire.  That will take  care of your tach reading issue.  That's what I did on mine instead of ordering the wire that had the resistor already built in.

R.F.

Dave wrote on 05/10/13 at 10:35:32:

I see you got the dashboard kit as well,  If you plan on using the LED's that came in the kit for the indicator lights, get 2 Diodes for the blinker indicators or they will light up when you hit the brakes. I do recommend the LED's instead of the incandescent bulbs as the incandescent bulbs aren't bright enough to see in daylight for the most part.

R.F.

youzguyz wrote on 05/10/13 at 11:15:48:

Correct, That is the exact same config I used with the resistors.

R.F.

Dave wrote on 05/10/13 at 14:16:59:

Ya need to make another trip back,  you need a total of 600K ohms  that is 600,000 ohms  not just 600 ohms.  Most likely what you will need to get at Radio Shack is a pack of 1M ohm resistors and also a pack of 100K ohm resistors.  Wire 2 of the 1M ohm resistors in parallel then add one of the 100K ohm resistors in series and you will have your 600K ohm resistance that you need.

R.F.

Update:

The 600 ohm resistor works....most of the time.  Every so often the tach goes into a spasm and reads very high numbers.  It seems to be related to a specific engine rpm - if Iincrease the engine speed or slow it down the issue goes away.

The other issue appears to be the common ground to the headlight area.  THe wiring harness for the left electrical control has a common ground that goes up and grounds all the left control functions....headlight, turns signals, horn.  When I use a turn signal - the fach responds with erratic readings and flashing warning lights for overspeed.  It appears I will have to serperate the ground for the tach and possibly the Vapor power from this common ground wire.

I will install a 600K resistor and move the ground.