maybe you could rig a shunt on a 12V gauge, apparently easy enough on the tool-type voltmeters - might check with a place like Ron Francis Wiring regarding value of resistor to use, or even if they have/know of a gauge source

Bill


Moved over to the Passing Lane

"When we tug a single thing in nature, we find it attached to the rest of the world" ~ John Muir
"When we tug a single thing on an old truck, we find it falls off" ~ me
Some TF series details & TF heater pics