Hello, I would like to do a compression test on my OM 642 in a ML 280 from the year 08. A corresponding test set is ready. Is there something special to consider or does someone have tips and tricks that are important? Especially I would be interested in the following. I had seen a post once. May be that this was on YouTube. Here a compression test was carried out and remote controlled with a button of the engine. Unfortunately, I can’t find this post any more. Can I just remember that the button was probably connected in the fuse housing in the engine compartment. Does anyone know how to do that?