How long is a 1” Fmk sensor with unions, pvc etc

[glb]

I know the actual 1” sensor is 4.5” but I’m wondering how long the whole setup is once unions are added. I’m trying to figure out if I have room in my return line for one. If anyone has this installed coupe you let me know how long all the components are? Thanks for your help!

 

[blaxsun]

At least 6-7".