Intellitronix GPS speedometer senders are designed to connect directly to your electronic speedometer to give you extremely accurate readings! No additional sensor from the transmission is needed to operate your speedometer. They will work with all Intellitronix or any other manufacturer's speedometers that accept an industry standard 4,000, 8,000, or 16,000 pulses per mile signal, or with any programmable speedometer. The senders come complete with a GPS receiver, an on-circuit-board antenna, and a microprocessor with LED status indicator that continuously convert GPS signals into a pulse stream that replicates the output from your mechanical speed sensor, but with GPS accuracy. You won't have anymore inaccurate speedometer readings due to different tire sizes or rear-end gear ratios.