Timing, Ground plug boots

[Charger_]

'03 Mercury XR6 150 CDM Carb engine

Can this be used to ground the plug boots so I can time the engine? Its a spark tester but I can set the gap to 0. Worried if my boots will reach. What would be the best spot to hook the leads that come off this tester? Any help you can give me will be much appericated.

 

[Charger_]

Updated attachment

 

[Dukedog]

yes and yes... big clamp anywhere on tha block or at tha battery ground at tha starter....

 

[Charger_]

yes and yes... big clamp anywhere on tha block or at tha battery ground at tha starter....

Leads will be long enough to reach the ground at the starter? Both leads need to be connected to ground or just the clamp?

 

[Charger_]

Leads will be long enough to reach the ground at the starter? Both leads need to be connected to ground or just the clamp?

This is what I use to ground the spark tester?

 

[Dukedog]

yep....