AutoMeter Sport-Comp 160 MPH Speedometer - Electric - Analog - 3-3/8 in Diameter - Programmable - Black Face DK13231SFI If you're a consummate engine

If you're a consummate engine tuner and know how to take advantage of minute changes in timing during a quarter-mile pass

If not available on your frame you may be required to drill a new hole on each side for correct mounting

1979-1985 Mercury Grand Marquis

Howe did better than just replace them

Double Seal Conversion

AutoMeter Sport-Comp 160 MPH Speedometer - Electric - Analog - 3-3/8 in Diameter - Programmable - Black Face DK13231SFI If you're a consummate engineTickets are no fun. Calibrating a speedometer isn't a great deal of fun either. AutoMeter's Electronic Programmable Speedometer makes short work of both, providing an easy to install and easy to calibrate solution that will help keep your speed exactly where it needs to be. Compatible with most factory speed senders, you'll wonder why you ever struggled with a speedometer before. Calibration is as simple as a two mile drive, or for even easier