Maintaining 12V While Engine Is Starting?

[zoomzoom]

This is a repost of what I put in the audio and security section. Not sure if that was the best forum for it:

I have a stepper boost gauge which is powered by an accessory circuit. When starting the engine, the gauge switches off and on again. The problem is I think the gauge has a self zeroing startup procedure, ie it centres the dial to 0 boost/vac. When it turns on the second time I believe its zeroing to about 0.1 bar boost (that is what it ends up on when turning the engine off, back to accessory position without disrupting power to the gauge)

Could a large capacitor be used to keep the gauge running in the short time while cranking the engine?

[89CAL]

I dont think you needed to start a new thread. You got some answers in the other thread.

I honestly think its either a problem with the way the gauge is wired in or a problem with the gauge/sensor itself. If it is a boost gauge made for use in a car then there is no reason why you should need to setup something to keep 12v at the gauge while cranking. All cars suffer a drop in voltage when cranking so I would find it highly unusual for the manufacturers of the gauge you have to have overlooked this

I have 3 electronic gauges in my car, all 3 stay on while cranking and I dont have any issues. So I think you should follow some of the advice given in the other thread and have a look at your setup