I've put in a fuel flow gauge. I absolutely love it. Next will be 4 cylinder CHT. More useful than EGT - you can lean by ear as well as you can with an EGT, and gives you engine health information.

Jeff Hersom N3740J '67 150G "Gremlin"
Hangar W-6, Helena Regional Airport
Places I have landed Gremlin:
[Linked Image from visitedstatesmap.com][Linked Image]