So I got an Tarmac (di2) and was wondering how to set this up with one of the following? What do I need?
Can only comment to say my Power2Max NG has been Flawless in the 3 years I’ve owned it.
Your title answered.
To your question, sounds like a Pairing Issue… Garmin, Wahoo, other?
Can connect over Bluetooth or ANT+
Once Connected, What Fields are of interest to you… Add those! 
I don’t have one but interested. Confused on what I need to buy to get it all working. Spider only, spider and cranks?
Talk to your local bike shop.
Well ok…
I have a Power2max NG eco, it’s been set-and-forget for several seasons. I’m using shimano chainrings, had to buy rotor 3D cranks from p2m as the NG eco is not compatible with the shimano cranks. If you have other cranks they may be compatible. Their support was also helpful and responsive. If you email them this question and details about your bike they’ll point you to a compatible model. I’m not affiliated with them in any way, just have had a great experience with them.
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As @aldenhart explains, I did exactly the same. Bought Rotor 3d24 cranks (now they have new cranks ALDHU or you can buy the cheaper option from P2M, slightly heavier) and NG eco P2M. Set it up in May 2018 and since then I only change batteries (and had to re-tighten it once because I didn’t put Loctite on).
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Depending on the cranks fitted to your Tarmac, you might only need a PM spider which can be bought on it’s own.
I’m a big Quarq fan but I would be happy with either of those PM’s for solid reliable numbers.
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Thanks all and that is what I was looking for. I am ultegra but will reach out to there support to make 100% sure. I am trying to look and get a ballpark.
Thanks and appreciate it.
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