Adding a digital volt meter

[dailyrider123]

Hardware store
Cheaper can be found online like ebay. Depends on what qualifies as "decent" to you

Something that'll be almost dead on when doing its job

 

[adulbrich 5,000+ posts]

Something that'll be almost dead on when doing its job

Well, even harbor freight has cheap meters that will read voltage and resistance. Nothing fancy. The leads on them might be junky though, so you'll definitely have to subtract the lead resistance when measuring coils