I'd like to do a compression test on my 240D sometime in the next few days, which I have never done before (on either car). I've always kind of wondered where the 240's engine stands, since it has loads of blowby and idles rough on and off but starts fairly easily even in the cold. I'm getting discouraged with this car, again, and maybe some compression numbers would help me one way or the other.
I have the FSM and have done a fair bit of forum-searching, but just want to double-check a couple things.
1-I have a remote starting device my dad gave me a while ago. This is going to sound silly, but I'm not really sure how to use it. In the FSM it says to attach to terminals 30 and 50 ... does it matter which leads goes where? At that point do I just press the button and hold it as the engine cranks?
2-Since I only have two hands I can't hold down the stop switch, so was going to try to wire it down. How tightly does it need to be wired? I.e., is it going to try to pop up and start or is slight resistance enough to keep it from doing so?
3-The shutoff line is the one going into the very back of the pump, right? How much vaccuum do I need to put on it to keep it from starting, and will applying vaccuum once be enough?
I could figure some of this out by trial and error but I'd rather not have it start accidentally while I'm trying to take a compression reading.

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1987 300D, arctic white/palomino--314,000 miles
1978 240D 4-speed, Euro Delivery, light ivory/bamboo--370,000 miles
2005 Jeep Liberty CRD Limited, light khaki/slate--140,000 miles
2018 Chevy Cruze diesel, 6-speed manual, satin steel metallic/kalahari--19,000 miles
1982 Peugeot 505 diesel, 4-speed manual, blue/blue, 130,000 miles
1995 S320, black/parchment--34,000 miles (Dad's car)