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I have a question. Let's say I have a custom 53 F100 with new ford 9 inch, and a carbed chevy 350/350 or ford 302/c4 and I want to put in new auto meter gauges and decide to put in all electrical oil, water, fuel, tach, and volt gauges because i hear they are easier to install and have no fluids in cab. What about the speedometer though, what would be easiest to install and calibrate, mechanical or electric?
With mechanical speedo, you will have to get new speedo gears and try them out to see which one you need to match your tire size, gear ratio, tranny ration etc.
Electrical, use any one and just calibrate it.
My Dakota Digital unit is electric, it came with a sender that goes in the stock speedo gear hole on the tranny, one wire to ground, one to the dash box. Then you do 60 MPH, and set it.
On a ford, just get the ford style sender and put on an electrical speedo. Should just bolt into the same spot on the tranny that the mechanical speedo cable went into. Very easy to calibrate and you can recalibrate it with changes in axles or tires. I used Autometer and like it a lot.