[TR] Gas tank sending unit - wiring.

[Angelo Graham]

Hello List:
Trouble shooting some wiring issues on the TR2 project and have a 
question about the wiring associated with the tank sending unit. Pretty 
simple wiring, but you know how this can work out.
My new harness has only one green/black wire for the unit and I have 
installed this on the center screw connection on the sending unit. 
Should there be another black ground wire from one of the mounting 
screws going to a ground point somewhere on the body?
The wiring diagram I have (TR2/3) shows both a green and a green/black 
wire serving the sending unit. I'm a little confused.
Thanks for any help with this.
Angelo Graham