A friend of mine has a 1972 142e volvo he told me it has one of the very first type of fuel injection systems, no computer, just 4 extra point sets so i would think it would be friendly to HHO. Any input would be a great help. The big problem maybe it has not run in 20 years.
He also set the 1967-1977 VW's also used the same system
Thanks Gary Diamond