You’re carrying a spare module? Okay, it still doesn’t work. What now?
Either way, without a meter, you’re still walking out.
And, strangely enough, you can get a multimeter that runs off your car battery. If your car battery isn’t working, you’re screwed anyway.
If I've narrowed it down to secondary spark and it is a universal problem, it can only be the rotor, HEI Mod, or the coil, or supply to the distributor. Everything else would be a miss in a cylinder, not a dead stop.
It has to have air, gas, spark, and time, so it is just a matter of elimination. There really isn't much need for meters at all.
Either way, without a meter, you’re still walking out.
The only "meter" I carry is a test light.
And, strangely enough, you can get a multimeter that runs off your car battery. If your car battery isn’t working, you’re screwed anyway.
The LED on a multimeter will not work in cold weather. The gauge may work better (if you can still find one), but will not be accurate or trustworthy. Automotive gauges are better because the workings are less delicate, but even they may not work well until the cab heats up.