Peter White carrys 5-pin TA rings that will mount on the Stronglight 49D crank. They're "outer" rings, 3/32" width, for the Pro-5 "Cyclotouriste" crank, but as noted above, they will work with 1/8" as well:
TAPL-50080302-40 TA Pro 5 Vis outer 40 $48.00
TAPL-50080302-42 TA Pro 5 Vis outer 42 $48.00
TAPL-50080302-44 TA Pro 5 Vis outer 44 $48.00
TAPL-50080302-46 TA Pro 5 Vis outer 46 $48.00
TAPL-50080302-48 TA Pro 5 Vis outer 48 $48.00
TAPL-50080302-50 TA Pro 5 Vis outer 50 $54.00
TAPL-50080302-52 TA Pro 5 Vis outer 52 $54.00
https://www.peterwhitecycles.com/tach.php#pro5