Do I need a sender for a ST 602 Sun Tach?

Howdy
I believe this is a ST 602 Sun Tach. Do I need a sender for it? it has 4 wires- red yellow and green in a light brown insulation and a single gray wire.
Cheers
Tony

 

NO body can help me?

 

What does the tag on the back of the tach say?

 

There is no tag on the out side

 

Take the tach out of the cup, the terminals will be marked as to where they go. Also on the back it will tell you whether or not you need a transmitter.

 

yes, you need a sending unit the black box,about 3"x6" in size

 

The only way you're gonna know which tach you have for sure is to take the tach out of the cup. It's no big deal, take the two acorn nuts off and pull it out. The 502 and 602 have about the same face, 502 takes a transmitter, 602 doesn't (I think).
The tachs that take the transmitter have a positive and a negative wire coming off the tach and a wire going to the light. That's all. The one piece tachs have a power wire, light wire, wire to the coil, and ground wire.
This is off the top of my head, so take it for what it's worth (not much).
Larry T

 

Thanks to all - I pulled the cup off and it's obvious it doesn't need the box.
Cheers
Tony

 

So anouther related question, on the ones that dont need a sender, are they switchable for 4,6, and 8cyl??

 

This one wasn't