'99 M750 Tachometer Solution?

[Doc]

Apparently mine has 2 pulses.  No way is my idle set at 2100 RPM.  Switched it to 2 pulse and my idle is at 1000-1100. 

@ downsides to this unit that I see so far:
1. It's not lit, so I can'r see it at night.  Not a problem for riding.  Problem for testing.  This will have to wait for tomorrow.  Too many deer out to focus on a tach anyway.

2. It does not update smoothly.  It is a static digital dispay, so it updated at set inetrvals.  Every 1/2 second was too frantic.  Every second seems better, but I need to try it on the road at steadier throttle than revving in the garage. 

Jury is still out.  I'm not racing the thing.  I just want to know what my motor is doing.  We'll se how it works out.  It may be a post for the "alternatives to high priced Ducati parts" thread.

Doc

[Howie]

If I was looking to add a tach to a Monster that came out of the factory without one and planned on using the original housing I would consider (budget allowing) replacing the speedometer with a tach from these folk  http://www.spatechnique.com/product_pages/page.cfm?cat=3  or from  http://spieglerusa.com/gauges-instruments/motogadget.html

[J-Speed Inc.]

I'm going to continue researching the addition of an aftermarket tach for my Ducati.  I'm thinking a handlebar-mounted electronic analog tach designed for a Harley might work nicely.

[J-Speed Inc.]

http://www.cruisercustomizing.com/custom-mini-tachometer-electronic-sportster-big-twin/part/BC-49-3374

Yes, I know Harley parts are the devil, but why try to re-invent the wheel?  This would mount to the handlbar, run the wire to one of the coils, supply 12V for the lighting, bingo!  Tach ahoy!

Does the M900/750 have a dual-fire, or 'wasted spark', ignition system that provides a pulse from the coil every revolution of the engine or is it 'single fire' meaning the spark plug only fires every other revolution for the power stroke?

[ducatiz]

http://www.cruisercustomizing.com/custom-mini-tachometer-electronic-sportster-big-twin/part/BC-49-3374

Yes, I know Harley parts are the devil, but why try to re-invent the wheel?  This would mount to the handlbar, run the wire to one of the coils, supply 12V for the lighting, bingo!  Tach ahoy!

Does the M900/750 have a dual-fire, or 'wasted spark', ignition system that provides a pulse from the coil every revolution of the engine or is it 'single fire' meaning the spark plug only fires every other revolution for the power stroke?

yes on the wasted spark.  the carb ignition is pretty simple, just flywheel lump passing magnets.

the harley tachs only go to 8000.  just a thought, redline on my SS is 9000.

[silas]

I've been looking for a 1"- 1 1/2"  tach for my '98 M900 for quite some time. I really like the 2 1/2" one posted but don't want one that big. Any ideas? (that aren't $400 and are analog looking/ style).

[pslinux]

I think 1 - 1.5" is going to be a tad small.  But here is a big list of "affordable" tachs I've been looking through, hopefully we'll both find something eventually.

http://www.summitracing.com/search/Department/Gauges-Accessories/Part-Type/Tachometer-Gauges/?Ns=Price%7cAsc&RC=100

[ducatiz]

I think 1 - 1.5" is going to be a tad small.  But here is a big list of "affordable" tachs I've been looking through, hopefully we'll both find something eventually.

http://www.summitracing.com/search/Department/Gauges-Accessories/Part-Type/Tachometer-Gauges/?Ns=Price%7cAsc&RC=100

most of those are for cars i.e. 4-6-8 cylinder.  you have to make sure the unit is capable of handling a 2 cyle with wasted spark.

[pslinux]

Correct, what would be the difference in L-2 vs. a V-2?

[ducatiz]

Correct, what would be the difference in L-2 vs. a V-2?

nothing.  if it works for a harley, it will work for a carbed ducati, just bear in mind the harleys usually redline at about 7000-8000 so you don't find many that are over 8000 rpm

[Speeddog]

Must point out that running a carbie Duc past 8000rpm is pretty much a waste of time....

So as long as going over the max on the gauge doesn't damage it, an 8k one would be fine.

[ducatiz]

Must point out that running a carbie Duc past 8000rpm is pretty much a waste of time....

So as long as going over the max on the gauge doesn't damage it, an 8k one would be fine.

depends on your gearing and ratios.. 

and if you have the flywheel and rods balanced...

[MotoPsycho]

It's a good thing I found this so I don't have to make a new thread. I just got a motogadget and it says the rpm wire connects to the negative side of one coil. I'm assuming that means the black wire on the 3 wire plug on one of the igniter boxes, right ? OOps, forgot to say '99 carb 750.

[bond0087]

I'm not positive on the exact colors of the wires going into the ignition module off the top of my head, but the wire that I would use is the one that the OEM tach would use for a signal, which does trace back to the negative side of one coil.  Even though your instrument cluster doesn't have a tach, Ducati still runs a wire for the tach signal up to your instrument cluster (or at least they did on my 2000 carb 750).

If my wiring diagram is correct, you should have a white/blue wire that goes to your instrument cluster, ending at pin J of the circular connector (if you look really close at the connectors in good light you should be able to see the tiny letters, I'm not sure if it is on both the female/male side, but it's definitely on at least one).   Hopefully that wire is there and it works out, because it's always nice to not have to add another wire or splice to the ignition system wiring.

PS: Hi from a fellow Hoosier!

[MotoPsycho]

Thank you but no dice. Pin J goes to the side stand warning light :-(. I compared prints and on the 2000 models that is correct. I do have it narrowed down to two wires going off of that print. In the motoscope instructions it says negative side of one coil and since the 2k print does in fact go to the igniter box I was looking in the right place. But though, the 2k print shows the tach lead coming from the hot side and if I do that I wreck a $500 dash. Thanks for the help. At least now I know I'm headed in the right direction.