Yaesu: Pair Yaesu FT-897 with ATAS 120A

[SarmArgon]

I can't find anyone wanting to be a rockstar on YouTube that has made a video of pairing a Yaesu FT-897 with an ASAT 129A.
Can someone walk me through this. I have tried but have no directions. The directions I have found expect me to be able to navigate the menu of the radio and leave out the step by step info necessary to accomplish this.
A step by step process would be perfect if you know where I can find one for this radio.
This is an install for a friend in his motorhome metal cab. Wire wheel brushed to raw metal installed ant mount 5200 marine quality sealant to keep the water out of the mounting surfaces. Clean mount. This isn't my first rodeo. I'm just having a hard time with the MENU driven radio.
Thanks.
Please help

 

[K4SPB]

https://www.yaesu.com/downloadFile.cfm?FileID=671&FileCatID=158&FileName=FT%2D897%5FOpMan.pdf&FileContentType=application%2Fpdf

rtfm. thats as step by step as it gets
pg. 39

 

[kg4icg]

If it is anything like the FT991A, you select atas in the menu for tuner, then hit tune button on the radio, depending what frequency you are on between 7.0 mhz to 450 mhz, the antenna woud tune. Atas120A get's the power for the stepping motor thru antenna lead.