If is a last gen NH 750 1992-2003 then the tach is broken inside. It is
about the only common failure on the bike. You can hunt for one on e-bay but
it may break as well. Or you can try to repair it like this guy.
http://www.nighthawk750.com/maint/tach-repair.html
Personally once I took mine apart and saw where I needed to solder, I just
closed it back up and rode with a broken tach.

On Fri, Sep 2, 2011 at 10:07 AM, Dave D <[email protected]> wrote:

> With anything electrical, it's all about connections.  I would disconnect
> and cleaner every connection, including grounds that you can find that are
> involved with it.  I would think using some dialectic grease to protect the
> connections would help but maybe there's a reason why you wouldn't use it on
> a bike.  Maybe someone else could comment on that.
>
> Dave
>
>
> On Fri, Sep 2, 2011 at 10:03 AM, Thomas Cuzman <[email protected]> wrote:
>
>> Can anybody help me out with my rpm gauge that is bouncing the bike only
>> has 8000 miles on it.
>> It appears to be an electrical gauge not a mechanical I just need to find
>> out what would cause it boumce like that or what I need to do to purchase or
>> to fix it.
>>   On Sep 2, 2011 6:13 AM, "Dave D" <[email protected]> wrote:
>> > Allen, thanks for the info.
>> >
>> > On Fri, Sep 2, 2011 at 7:09 AM, Allen Thomas <[email protected]>
>> wrote:
>> >
>> >> ** You can go to one of the online vendors and browse the parts fiche
>> for
>> >> exploded views. What I did was copy/paste them into excel so I have an
>> >> offline copy. Also the service manual needs a companion "common service
>> >> manual" which can easily be found online. The actual service manual
>> only
>> >> covers bike specific.
>> >>
>> >> Sent via BlackBerry by AT&T
>> >> ------------------------------
>> >> *From: * Dave D <[email protected]>
>> >> *Sender: * [email protected]
>> >> *Date: *Fri, 2 Sep 2011 06:24:39 -0400
>> >> *To: *<[email protected]>
>> >> *ReplyTo: * [email protected]
>> >> *Subject: *Re: [Nighthawk Lovers] Service Manual, Owner's Manual
>> >>
>> >> Sounds like maybe I'll start with the Clymers or Haynes and then
>> graduate
>> >> up to the Honda service manual. I need to search around the old
>> messages
>> >> here, I remember seeing a link to the parts fiche. I need to find the
>> size
>> >> of a missing screw that holds down the left side panel.
>> >>
>> >> Thanks!
>> >>
>> >> Dave
>> >>
>> >> On Thu, Sep 1, 2011 at 6:20 PM, Damion Champ <[email protected]>
>> wrote:
>> >>
>> >>> I have used my service manual EXTENSIVELY. Definitely worth the price.
>> >>>
>> >>>
>> >>> --Damion
>> >>>
>> >>>
>> >>> On Thu, Sep 1, 2011 at 4:23 PM, Allen Thomas <[email protected]
>> >wrote:
>> >>>
>> >>>> ** Usually the Honda service manual only shows exploded views, parts
>> >>>> removal order and torque specs. It's up to you to figure out how to
>> get the
>> >>>> parts off. Clymers are the best IMHO, but the Honda service manual is
>> handy
>> >>>> since Clymers/Chiltons don't usually show exploded views.
>> >>>>
>> >>>> Sent via BlackBerry by AT&T
>> >>>> ------------------------------
>> >>>> *From: * Kurt Nolte <[email protected]>
>> >>>> *Sender: * [email protected]
>> >>>> *Date: *Thu, 1 Sep 2011 15:30:49 -0400
>> >>>> *To: *<[email protected]>
>> >>>> *ReplyTo: * [email protected]
>> >>>> *Subject: *Re: [Nighthawk Lovers] Service Manual, Owner's Manual
>> >>>>
>> >>>> The Honda branded service manuals are really awesome, and only a
>> couple
>> >>>> bucks more than a chilton's or Clymer type manual. If you are
>> reasonably
>> >>>> familiar with things like basic diagnostics and simple mechanics,
>> just get
>> >>>> the Honda book. If not, also pick up a Clymer's for the "for novices"
>> type
>> >>>> information.
>> >>>>
>> >>>> Both of them together would only run you into the 70s with shipping,
>> I
>> >>>> feel. I've gotten each of mine for about $30 shipped, usually ebay.
>> >>>>
>> >>>> Kurt
>> >>>>
>> >>>> On Sep 1, 2011 2:47 PM, "Dave D" <[email protected]> wrote:
>> >>>>
>> >>>> 1993 Honda Nighthawk 250
>> >>>>
>> >>>>
>> >>>>
>> >>>> On Thu, Sep 1, 2011 at 2:39 PM, Graham Rogers <[email protected]>
>> wrote:
>> >>>> >
>> >>>> > model, year and size o...
>> >>>>
>> >>>> --
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>> >>>>
>> >>>
>> >>>
>> >>>
>> >>> --
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>> >>>
>> >>>
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>> >>>
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