Anyone have tips?
 

On installing 52mm volt meter and tach?

I'm going to get a dual gauge pillar and those 2 gauges. My current tach doens't work since i put the glow gauges on so i decided now my cars a manual to get one.

My system also draws a lot of power and i'm used to measuring my voltage in my other cars.

Anyone have any tips?

I don't know for sure, and I'm sure someone will tell you for sure, or direct you to the info.

But i'm assuming [off of what my friends have told me after installation] is it's just splicing the wire to the original tach to the new one.

Fish the wires through the pillar...

You said you're used to monitoring the voltage, Have you had the gauge in the past? Did you do it or have someone do it? If you did it... I think there's your answer - Just curious