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I have 3 units a pathfinder unit with 7 regular and 3 ion rifles, and two units of 10 regular fire warriors shooting at a unit of 20 necron warriors behind a wall for cover. The pathfinders can shoot at the necrons without them getting a cover save and roll for marker lights and score 5 markers. I spent 3 markers to give 3 bonus to bs to all 3 of my units and spend 2 marker to give ignore cover for one of the basic fire warrior units. Then I have the ion rifles shoot with their increased bs, one unit of fire warriors increased bs but no ignore cover. And last unit of fire warrior increased bs and ignore cover. Did I do this right? Or just horribly wrong?

Almost right. All firing from a into is done at the same time, so the pathfinders with the ion rifles could not benefit from any markerlights.

Some mistakes.
Mistakes:
1) The markerlights aren't networked, so the ion rifles can't use them.
2) Did you increase all the units to BS6? or BS4? Because the former is incorrect.

Edit: Ninja'd

What if I had a second identical pathfinder unit doing same thing. Would their markerlights give bonus to the other pathfinder unit and vice versa?

And both fire warrior and pathfinders have 3 bs then with 3 bonus bs it would technically be bs 6 but I wouldn't get auto hit I would just get 2+ hit but made me feel better use that extra marker rather have it go to waste

Pathfinders 7 marker lights and 3 ions rifles shoot Necrons. You resolve the Ion Rifles and give the Necrons 5 marker tokens. The unit firing the marker lights cannot benefit from its own markers.

The next unit then targets the Necrons. It can choose to expend the marker tokens to either increase its BS (1 token per) or give its weapons Ignore Cover (2 token)

One firewarrior squad used 1 token to increase its BS to 4, and 2 tokens to Ignore Cover. It then resolves its shots. The Necrons still have 2 tokens left.

The next Firewarrior unit can use both tokens to increase its BS or Ignore cover with the last 2 tokens.

Why 1 token per, it says all models shooting at target gets bonus bs.

 ruthlessgamer wrote:
Why 1 token per, it says all models shooting at target gets bonus bs.

It doesnt say that. You have to expend the tokens immediately before shooting at the target. Those tokens only apply the the unit doing the shooting... Pg 68.. 2nd para

But same page read pinpoint. That's what's thought was allowing all to gain the bonus. But I see what you mean now. I was just ever taking a single unit of pathfinders now ill just have to take more.

 ruthlessgamer wrote:
Why 1 token per, it says all models shooting at target gets bonus bs.

For that Shooting attack. Meaning the unit your are currently using not the next unit which will be the NEXT shooting attack.

Yes, all models in that particular unit that expended the tokens gain an increase in BS. Note the part ".... as part of this shooting attack.."

Markerlights are Tau's best friend.

Can I use marker lights to improve bs of another pathfinder unit to get more marker lights?

 ruthlessgamer wrote:
Can I use marker lights to improve bs of another pathfinder unit to get more marker lights?

Sure.

Perfect thanks everyone.