SPEEDOMETER (autometer) Which one to buy?

[juanblzer]

alright:
I don't have a factory dash.
its all tube and guage panels (in fact I already have 3 autometer ultralite guages.
I am very interested in purchasing an Autometer speedo but I'm not sure which one to get (electrical/mechanical) I have a np208, 4.10 gears, a 700r4, 350crate, and really want to know the pros and cons of each. Thanks in advance. Also can they be calibrated for bigger tires (i.e. going from 315x75xr16 mtrs to 40inch mtrs eventually)

thanks in advance for all the help

 

[Shaggy]

Electric can be calibrated for bigger tires but it ends up being pretty pricey once you get the senders and whatnot. The mechanicals are a 1:1 ratio, you need to either change the drive gear in your t-case to make the speedo read correctly, or you need to get a conversion box to put between the t-case and speedo cable. I got a custom conversion box, it ran me about $70 including 2 runs on a dyno (speed only) to get it calibrated perfectly.

 

[K5MONSTERCHEV]

Id say electrical. I have one and I reset it for my 42s and when I put the 38s on and its dead on. I think it was like $210 for the speedo and $60 for the sending unit, but well worth it! /forums/images/graemlins/thumb.gif