| T O P I C R E V I E W |
| burnoutboy |
Posted - Apr 26 2006 : 8:03:55 PM
Hello.
I recently went to my local Automotive parts store and saw cheap tachometres.Going from memory,the wires on the back were green,red and black.
I have a small single cylinder motorcycle engine that I would like to configure one of these guages to.This is a cheap alternative to one of those $300+ tachometers.
Would this be a simple project??I have BASIC electronic knowledge and am a willing and fast learner...
Thanks in advance for the help
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| 3 L A T E S T R E P L I E S (Newest First) |
| Aaron Cake |
Posted - Apr 28 2006 : 10:46:51 AM
Probably. But don't assume anything. Check the instructions first.  The other signal wire probably goes to the negative side of the primary of the coil.
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| hob_the_builder |
Posted - Apr 27 2006 : 5:18:25 PM
so i take it that you put the black and red wires to a battery, but would the green wire go onto the ht lead or on to the end of the points?
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| Aaron Cake |
Posted - Apr 27 2006 : 10:21:28 AM
Most single cylinder engines fire one spark per rotation (one at the compression stroke, and then a "waste spark" into the exhaust). A 4 cylinder fires once every 180 degrees, or twice as often. If you set the tach for a 4 cylinder it will display 2x the RPM of your single cylinder. You can use a frequency divider to chop the frequency in half.
Also, have you checked out the tachs used for junior dragsters? They aren't too expensive and are already designed for single cylinder engines.
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