Does anybody have any experience using an SCT chip in an obd 1 mark? There is one for sale locally on c-list, the guy says its never been installed selling for $250 its the #6600 PROGRAM intended for the DZA1 computer which is what came in mine originally..I can't find any pricing online for this specific chip so I don't know if 250 is even a deal or not..anyone have any info about this chip?