Using the RPM Arrow Image Object ( VDASH-EMU v1.1 or greater ):
it is really straightforward, read the following instructions.
extract the zip archive
and put the RPM Gauge and Arrow images in your /vdash_template/pictures/ directory
(check the sticky post to learn where is your /vdash_tenplate/ directory )
All images are png 540 x 540 pixels
see the last post to download the zip archive