Factory tach question
 

Anyone know what the difference is between the factory tach listing they list two tachs one to 1992 for 112.00 and from 1992 it’s 60.00 i thought maybe it was the rpm range but a 60.00 difference seems a little steap. I want to replace my 4 cyl cluster with the 8 and I don’t want to buy a cluster and find out it won’t work