However, you might want to separate them into alternates in the firing order, which some people have claimed is theoretically slightly beneficial.
For a V2.
The simplest way to see this is by hooking it up to a cheap analog voltmeter and using a wrench or other non magnetic - soft iron; piece of metal.
It is also possible for a too rich mixture to result in cool exhaust gas temperatures that cause the sensor to read low as it would during warm-up.
Normally, you want to ground the opto-isolator by connecting XG1 to XG2 with a jumper.
It has worked well on a number of installations.
If you have a problem where in which you:
Handgun Caliber Guide 6.