My tach quit working the last time out, I was wondering if anyone knew anything about these. Such as wich wire is the tach feed from the motor?  

Takes three things to make the tach work.  A good negative battery connection (ground) and good switched positive battery connection (12 volts when the key switch or power switch is turned on (normally the key switch) and a good signal from the rectifier.  

First thing I would do is to connect a voltmeter across the battery, crank the motor, (in water or on muffs) and rev it up to approx 1,500 rpm and see if you're getting approx 14 or more volts.  If you're not getting  a voltage increase from battery voltage or very little increase with the motor running, you have probably blown the rectifier/regulator or possibly a stator, or possibly both.  This is a very common cause for the tach not to work.  Trying to run weak/bad batteries is the main cause of the reg/rec and stator going out.

Then I would check the negative and positive connections on tach and make sure the positive has battery voltage and zero resistance between the negative side and battery negative.

If all these check good, you will need to check your signal voltage.  If that's good, you need to look at getting another tach.

I know its charging the batts, I check them after every trip out. When this went out the tach jumped around a little bit and just quit. Looks like a tach but just wanted to make sure i had signal first, and can't figure wich wire is the feed. So i guess i got to go and get a wire schematic, I was just hoping someone new wich wire was the feed to save me time lol.

thanks for your input

I think they often use a green wire for the engine PU to the tach.  That may vary from manufacturer though.