Well I have these 2 addons, A rev limiter that simply turns your ignition on and off when you hit a certain rev limit.
I also have a tachometer and boost gauge:

Here is my cfg.txt:
http://chris.site11.com/stuff/1.php

But I can only run 1 at a time and I want to run both
This is what i have in the shortcut:
D:\Games\LFS\LFS.exe /insim=29999

Not possible unfortunately

And edit that pic out of your post asap.

Use outgaugegateway

Download at this post:
http://www.lfsforum.net/showthread.php?p=1472720#post1472720