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Modifying your Tachometer for a V-8 Conversion By Mike Stanford When you pull your 6-cyl and drop in that V-8, the dash mounted tach will need to be modified. I finally got around to doing mine so I documented what I did. It is a simple procedure, just requires disassembling the tach and adding a resistor or two to re-calibrate. The whole thing takes less than an hour and costs about 25 cents. Step 1: Remove and disassemble the tachometer. Step 2: Install resistor(s) to reduce speed indication. Step 3: Reassemble the tach. Re-install the unit and enjoy a correct reading. Please note: the XJ-S and some earlier XJ-6 tachometers will require a 330 ohm 1/4 watt resistor instead of the 267 ohm combo mentioned above. A prudent test would be to use an inductive tach to measure engine speed and verify that your modification is correct. Back to Jaguar Conversion page
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