new monitor really old sensors

a dicky john PM100 monitor and seed sensors in a 40? year old allis74 plate planter should they be compatible? can the sensors be tested?retrofit possible? agco doesn't have replacements
help
C
 
thanks guys it seems the sensors are not too tuff to test they have visible light beam i had one good one one with bad receiver one with bad emmiter good grief a neighbor will let me "rape" an old four row for more sound ones what a tightwad i am !!
 

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