Aftermarket gauge questions

[AnotherA]

Looking at Autometer gauges and I'm wondering how they measure them.
Is it the readable area or does the 2 1/16 measurement include the gauge bezel?
Called to late tonight and they are closed.

Any benefit going to an electronic speedo over mechanical?

 

[Backtobasics]

Measurement is the diameter of the body of the gauge, that goes through the hole in instrument panel.

The 2 1/16 gauges will normally slide right into a 2" hole opening.

Main benefit to mechanical is the plumbing. No tubing to pinch or leak, or run through the firewall. Electrical are usually a bit more expensive, but easier to install and plumb/wire.

 

[Swinger71]

With the electric Speedo you will have to get the hall effect sending unit for the transmission. But calibrations is a easy as putting the speedo in cal mode and then driving like 2 miles and it its set. It is nice if you change tire size or gear ratios.

 

[AnotherA]

Thanks guys! That helped a lot.