The pension index by unit card, on Fold3 here:
https://www.fold3.com/image/4929812?terms=wiltse
says
Abram Wiltse
private co. K, 9 Reg't Minn Inf
enlisted 22 Aug 1862, discharged 24 Aug 1865
applied for invalid pension 22 June 1885 (application 543040, certificate 541854)
died 24 Oct 1901
it also has cross-references:
See IC [invalid certificate] 402977 Edward Price, E 2 Minn Cav
See WC [widow's certificate] 188924, MC [minor's certificate] 182302 Lee Thompson K 5 Minn Inf
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The pension index by name card, available on Ancestry, at
https://www.ancestry.com/interactive/4654/32959_033193-00491?pid=17253, just has name, regiment, and the application date, number, and certificate number