I've used a piece of wire curved to ride the piston and side up and down in the spark plug hole. While you could probably rig a dial indicator off of that if it checks out as correct just watching the wire peak you may be satisfied without.


1955 1st GMC Suburban | 1954 GMC 250 trailer puller project | 1954 GMC 250 Hydra-Matic | 1954 Chevy 3100 . 1947 Chevy COE | and more...
It's true. I really don't do anything but browse the Internet looking for trouble...