Talked to someone and they found in a book called: DAR Roster of Soldiers buried in IN. Does this look like your John Gardner?
1961 book page 152 listed this:
John Gardner Harrison Co
Born- About 1760
Service- Enlisted in Maryland 1778, in the Co. under William Buchanan 3rd Regt. Served until June 1781. Discharged in Philadelphia.
Proof- Pension Claim S 35963
Died- The last payment of pension was made March 27, 1827
Married- Mary ----- Ch. Dan,. Phebe, Matilda, Horatio, John, Wilson