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rear tank couldn't serve BOTH water injection and windshield wiper duty at the same time, especially if you're using washer fluid as your "water injection fluid" anyway.  (some people like Damon have mentioned previously that winter washer fluid in particular is "ideal")   Then its just a matter of:  can you utilize the oem level indicator (for WI purposes) which the rear tank already has?  Or,  like you said, can you retrofit the snow kit's level indicator into it. 
Inzane  (formerly Z-Jay) 
   
 
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