is this a amp meter or a volt meter?
if it's an amp meter what is the max amp?

 

The factory gauge is an ammeter.

However if everything is working fine the needle should barely move one way or the other.

Factory alternator is usually 65 amps.

 

any way to get a volt meter in the factory cluster?

 

This doesn't directly answer your question, but the most practical route is to install a gauge cluster on the bottom of your dash. Here is mine. The voltmeter is in the middle.

 

interesting idea. I've had the individual gauges in and out, and have swapped gas gauge and ammeter gauges into and out the gauge cluster bucket. I know there are specialists that rebuild and restore old gauges. Its not hard to wire a volt gauge. Seems like somebody could put volt meter guts behind a gauge blank, and then paint appropriate marks on the face. It'd be a custom job, but I bet it wouldn't be that hard for the right customizer

 

I don't want to hijack the thread, but what are the normal readings on your Sunpro gages?

 

This how my set up is,water temp,volt and oil pressure :

 

Temperature is at 190 degrees F. In stop and go traffic in the summer it sometimes creeps to 195. Voltage is at 14 volts in park or cruising. If I load down the system at a stoplight in drive, it gets down to 12. Oil pressure is about 60 psi at startup, 30 or so while driving, and about 15 at hot idle.

 

What are the other two gages by the steering column?

 

Tach and a tranny temp gauge.