Help fitting voltmeter guage Mk1

[xpeterpx]

I fancy installing a voltmeter in my Mk1. I understand running the + cable direct to the battery but can anyone please advise where I link the negative wire to safely. 

Im also concious I need it to power off with the car too?

Thanks for any advice

Pete

[Devonboy]

Why not use one of these, cheap as chips and it does the job :-

https://www.amazon.co.uk/d/gqf/Jazooli-Digital-Car-Cigarette-Voltmeter-Voltage-Battery/B00G0HIXJ2/ref=sr_1_48?s=automotive&ie=UTF8&qid=1500346498&sr=1-48&keywords=led+voltmeter

[xpeterpx]

Ok but just does not look right. 

Hoping to get a dial in maybe in a pod but was just curious about the wiring in 

[Carl123]

8 hours ago, xpeterpx said:

....Im also concious I need it to power off with the car too?

Thanks for any advice

Pete

Should be no need to power off with the car, unless it's an illuminated display (bulb)

Mine is wired in permanently, so that if I do not use the car for several days, I can just peer through the window and see if the voltage has dropped enough to warrant taking it for a drive to charge up the battery a bit.

[Gizza11]

Any earth -Ve ( behind a bolt on boady work ) will do and any switched  +Ve supply so that it switches off  with the ignition and one to your lighting circuit so it lights up when the lights are on. You can put a fuse in line with the +ve so that if the gauge goes faulty you have some protection. Done this many times in other cars not a problem its all the same. Use a multi meter  to check your wiring for what is switched or not ,makes things easy then. Use a piggy back fuse in your fuse box for the  switched +ve.( forget what the piggy back fuse is called but plenty on EBay).