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i was wondering if anyone has put an aftermarket tach on their ski specificly a gtx 580 93 model , i have an autometer tach to go in the cowl and i was wondering if anyone knew what wires to tap in to for the tach signal thanks
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Re: seadoo 580 tach installion
The problem with these tachs is that they are set for 4-stroke motors. On a 4 stroke 1 plug fire = 2 revolutions. And the tach sees ignition tigger events. So on a 4 cylinder we have 4 events/2 revolutions, or 2 events / revolution. An 8 cylinder is 8 events / 2 revs or 4 events/rev.
On a 2 stroke 1 plug fire = 1 revolution. So that's 2 mag events / revolution.
OK, lets pretend you set your tach to 4 cylinder mode an use it on your ski. In 4-cylinder mode 4 events/2 revs (2 events / rev) should give your ski the correct reading if the mag actually sends 1 event for each cylinder.
To do this connect wires as follows:
red = +ve
black = -ve
white is usually the tach face light
yellow/green = pulse.
The pulse line would go to either the B/Y wire from the magneto housing.
Let us know if it works.
Eldon.
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