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Why does my tach read backwards?

jerold

jerold

Regular Contributor
1998 Bayliner Capri, 1987 Force 125.......
Does this mean the positive and negative wires to the gauge are reversed?

Other gauges are working fine.
 
I di find the switch on the back to NOT be in the 4 cyl position, the boat used to have a 90. I switched it, no difference. I also ran the positive and ground from the controls (remember, they were hooked to the battery ). No change. Should I replace the rectifier? Can it be tested? What exactly does a rectifier do? Is it like a regulator?
 
Got the test procedures. Will test it after I pull it out of the water Sunday night and see what the test says.
 
What year and make was the 90 that was on there? The 125 force takes a special tach made for 20 pole stators. The 90 HP was the same as a 125 until 1991 rev H.
 
A big AAAAHHHHAAAAA! The boat is a '98 Bayliner Capri. I assume the Force that came on it was a '98. However, the 125 Force I have on it now is an '87. So you think I need to remove the tach and get another that is the 20 pole deal? Exactly what tach should I be looking for?
 
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