Have a question on a swap I'm doing
 

First wanna say what's up to everyone new to the site...ok I have a question I have a 2003 silverado v6 bought a complete motor 5.3 with the wiring harness and pcm off a 2001 silverado I got it that year cause I want to leave it cable driven but are my gauges gonna work cause mine reads 120mph and the 99 to 02 reads 100mph thanks in advance

Anybody ?

The speedo should work fine. Both years use a 4000ppm signal out of the PCM to the speedometer so any speedo that uses that will work.

Thanks bro