1990 tach op amp needed

[ZRFun]

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While calibrating my 1990 ZR-1 tach, the connection on the potentiometer I was using to determine the value for a fixed resistor, came loose. That resulted the op amp (tach driver) running wide open for a couple seconds before dying.

The numbers on the chip are-

9907A
CS8939J

Can anyone tell me if this op amp is common with other 90-96 tachs? (The "J" at the end of the date(?) code has me wondering if it refers to the "J" designation in the VIN numbers of these cars, and by extension something "special" about the op amp. Ooooh, I hope not!)

Paul Workman

[Rob]

Since this post has nothing to do with Zip Corvette, I'm moving it to the ZR-1 forum...