Speedo question

[85k10383]

I would like to switch to a 100 MPH speedo, what would I need to change in order for it to read accurately? I currently have the 85 MPH speedo. Is it just the driven gear that has to change? TIA guys

 

[89Suburban]

I don't know. I'd be lucky to hit 65 mph in my POS, lol!!!

 

[bucket]

Nothing needs calibrated, the speedo itself takes care of that. However, the older 100mph speedos don't have the provision for the VSS on the back of it. If you don't have cruise control or FI, it won't matter though.

 

[85k10383]

So its just buy the gauge and bolt it in then? I have neither FI nor CC so I shouldn't have any issues. I would like it to read accurately with my 33s though. For that I'm sure I need a different driven gear.....