It's located between the front bracket and the tensioner body. if it's not there, then it's broken and needs to be replaced. The pointer is plastic and can be broken (maybe it's nylon, dunno..) Not sure if it's a singular replaceable item. Check with Parts Shop..

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Jeff Lawrence
1989 300e
2000 Dodge Grand Caravan SE
No matter what you fix, there will always be something else to fix..
"Warranty" is just another way of postponing the inevitable.