Revving 4000 rpms on the highway

RogerRamRod said
Tach have a 4-6-8 switch, set on 6?

that would be 75% of the V8 readings, pretty close at 3200 with normal convertor slippage. Ive never come across an tacj with the 6 cyl loop/switch enabled, seem to all come off V8s......