04-08-2019, 08:15 AM
(This post was last modified: 04-08-2019, 08:17 AM by wild_willy.)
I use my electronic timing light which will indicate RPM and also has a dial back feature for setting max. advance. It is 12Volt and can be used with a separate 12V battery or a 6V to 12V inverter as I have done.