Where to connect a spade for key-on ignition in fuse block, '70 Charger

[Coelacanth]

Guys, I need to connect a few spade connectors to the back of my fuse block for a tach and voltmeter to come on when key is "on", but not to "start". I tried searching for the relevant blue IGN 1 wire under the dash but the wire schematic diagram has me confused and I couldn't find a wire I could be certain about to splice into. I'd rather just spade it into the fuse block. I see a few open male spades here, where should I connect my tach/voltmeter? Thanks!

 

[Kern Dog]

I had a minor meltdown then replaced my fuse panel with one that had one additional fuse in it. From 6 to 7 fuses.
I later added an additional fuse panel that is powered through the starter relay with a relay in between.

 

[gkent]

I recently did something similar but don't recall which tab I used. However its easy enough to figure out with a test light or meter.

 

[toolmanmike]

I later added an additional fuse panel that is powered through the starter relay with a relay in between.

View attachment 1919484

I was wondering if you found a different power source. More current through the bulkhead on these old cars is electrical suicide.

 

[Coelacanth]

I recently did something similar but don't recall which tab I used. However its easy enough to figure out with a test light or meter.

Thanks, I was hoping to know before I reinstall my instrument panel and don't want to connect a battery until that's back in the dash.

 

[gkent]

You don't need to connect a battery if you use a meter. One side to ground and touch the tabs with the other. The key on tab will not complete the circuit. Now put the key in the "on" position and that tab WILL complete the circuit.

 

[Coelacanth]

Sounds too easy. I'll probably test that out tonight.