cop question

[astra vxr]

im going to be useing these as i already have them (see pic )

just wanted to check something

Pinout, looking into the coil connector moulding itself :

Left to right : Ground - Trigger - Tach - 12V

ground = engine ground
trigger = ecu pins g8 g9 b16 g16
tach = ????
12v =12v

The dwell should be
8V 6.3 ms
9V 5.3 ms
10V 4.4 ms
11V 3.8 ms
12V 3.2 ms
13V 2.7 ms
14V 2.4 ms
15V 2.2 ms

what do i do with the tach do i leave it out ??

cheers