IIRC Starret had a less expensive dial bore gauge where the dial travels with the mechanism.
It was much less expensive than the kind where the dial is at the handle end and came with different extensions so you could use them in cylinder bores, and perhaps in main journals, but I don't know if the rod journals are big enough, I used to see it in he Grainger catalog, but it's not in my current one.
The other option is a set of "snap" or "T" gauges where you can measure them after you've fitted them to the bore you are measuring (if you already have an appropriately sized micrometer, this is likely your least expensive option).
