Wiring gauges into trip computer power?

XJ-S
1

So I’ve removed my trip computer, and will be putting electric gauges in there.

It would be very convenient using the trip computers wiring. There are two supplies of 12V, one power lead is when headlights are on, so perfect for illumination. But the other is always live, even with ignition off. If I hook up my three electric gauges to that, will that draw way too much and kill the battery?

Or is there a power supply with ignition on from perhaps radio or cig lighter nearby?

2

The green wire feed to trip computer is already ignition feed. Same circuit as the existing instruments.

3

Thank you! Yes it is.

4

Guages always on? Mebbe not. OP for example would not be as the ground leg would be open
with the engine not running.

And the red is always hot to power the TC’s memory.

But, aye, an ignition on wire is best suited.

OTH,. what gauges? Duplicates Or added.
I’d be delighted to see an ammeter!!! Live guages sans "stabilization.,

Carl…