2006 883R Tachometer RPM - Harley Davidson Forums: Harley Davidson Motorcycle Forum
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post #1 of 11 (permalink) Old 08-18-2019, 03:29 PM Thread Starter
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2006 883R Tachometer RPM

I just added an aftermarket tachometer to my Sportster and I'm only getting 1500 RPMs at 50 miles an hour 5th gear, is that right? Idles at 500.

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post #2 of 11 (permalink) Old 08-18-2019, 03:49 PM
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Sounds like it may be 'mis-set'.

On many tachometers, there a switch, screw or jumper to adjust for the number of cylinders. (1 cyl., 2 cyl., 3 cyl., 4 cyl., etc.)

You may have to remove the housing to get to it.

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post #3 of 11 (permalink) Old 08-18-2019, 05:38 PM
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^^^ Yup, its only giving a reading of half the RPM

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post #4 of 11 (permalink) Old 08-19-2019, 05:37 AM
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Is the tach, made for Harley's? If so what years? Early Harleys are dual fire,( both plus fire at the same time) newer ones fire each plug separately. Check the years your tach is made for.
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post #5 of 11 (permalink) Old 08-19-2019, 09:19 PM Thread Starter
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I found out it is a single fire ignition have to buy a separate adapter that runs both of the coil wires together into one..
WTF how about make a motorcycle tach that works on all types 1cyl to 8cyl
False advertising.

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post #6 of 11 (permalink) Old 08-20-2019, 06:31 AM
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Some tach do work on all combinations, but it's up to the user to buy the correct one, or to set the set the switch to the correct setting.
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post #7 of 11 (permalink) Old 08-20-2019, 10:19 PM Thread Starter
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He had s list of what it worked on. My bike was listed. Guess im a dumbass for believing the written word. My bad.

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post #8 of 11 (permalink) Old 08-23-2019, 01:26 AM
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Why

Why do you need a tacho anyway?
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post #9 of 11 (permalink) Old 08-23-2019, 07:28 PM
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Quote:
Originally Posted by 45auto View Post
He had s list of what it worked on. My bike was listed. Guess im a dumbass for believing the written word. My bad.
Back in the day, I bought a large chrome Sun tach with a metal housing for one of my cars.

The catalog listed all of the American autos it worked on.

When I received it, the instructions had an alphabetical list of cars followed by the 'adapter' number needed to make it work.

Danged adapter to make it work cost more than the tach did.

Sent it back.

I didn't read the fine print.

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post #10 of 11 (permalink) Old 08-24-2019, 11:03 PM Thread Starter
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Ok got it figured out. I have a single fire coil & have to combine front & rear signals together using a adapter rig.
Made the adapter rig they showed of a resistor & diode on each cylinder signal wire & all together to tach green. Idling around 900 now. Much better but will check it for accuracy.
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