# Ammeter, volts and RPM gauges

**URL:** <https://community.electricforum.com/t/ammeter-volts-and-rpm-gauges/17321>\
**Category:** GEM Forum\
**Created:** [October 17, 2019, 2:58pm UTC](https://community.electricforum.com/t/ammeter-volts-and-rpm-gauges/17321 "2019-10-17T14:58:59Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![JarJarJava](https://yyz2.discourse-cdn.com/flex030/user_avatar/community.electricforum.com/jarjarjava/32/15158_2.png) [@JarJarJava](https://community.electricforum.com/u/JarJarJava)\
**Post date:** [October 17, 2019, 2:58pm UTC](https://community.electricforum.com/t/ammeter-volts-and-rpm-gauges/17321/1 "2019-10-17T14:58:59Z")

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I’m looking to potentially add amps, volts and RPM gauges for the GEM, a lot of the links in the old thread from 2016 are broken, a few still link. Are the ones in that thread still the best options, or are there newer / better monitors available?

I also seem to have my dash off a lot these days, so if anyone knows of some round gauges (bonus points for analog) that I can set up as pillar gauges, that would be sweet.

Thanks.

> [@Ammeter](https://community.electricforum.com/t/ammeter/5818):
>
> Hey all, I’ve seen a few suggestions to install an ammeter to keep an eye on power draw. Anyone have any recommendations on what kind to install or wiring info on how to get it installed? Thanks

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**Author:** ![Inwo](https://yyz2.discourse-cdn.com/flex030/user_avatar/community.electricforum.com/inwo/32/1067_2.png) [@Inwo](https://community.electricforum.com/u/Inwo)\
**Post date:** [October 17, 2019, 3:55pm UTC](https://community.electricforum.com/t/ammeter-volts-and-rpm-gauges/17321/2 "2019-10-17T15:55:58Z")

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Any volt meter or ammeter for appropriate range will work. Analog are out there.  
Use any V-8, 4ppr, tachometer. Needs to have isolated “pickup” or an isolated dc to dc converter to connect to motor sensor.  
At one time, I made a MM with tach output.

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**Author:** ![Old\_Houseboater](https://yyz2.discourse-cdn.com/flex030/user_avatar/community.electricforum.com/old_houseboater/32/544_2.png) [@Old\_Houseboater](https://community.electricforum.com/u/Old_Houseboater)\
**Post date:** [October 18, 2019, 3:29am UTC](https://community.electricforum.com/t/ammeter-volts-and-rpm-gauges/17321/3 "2019-10-18T03:29:41Z")

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I just put 9 magnets on the drive axle cup for the pick up on my first one. 8.9 gear box. Wrapped with a layer of gorilla tape worked good. Second one I put a hole in the tach pickup and attached a little magnet to the screw that holds the magnet on. Also worked good. However since the motor is hooked directly thru the gear box the RPM can be directly calculated. I have an interactive spread sheet that covers all classic GEMs Just enter the tire diameter and it gives RPM for all gearbox ratios. Email me and I will send you one.  
Rodney  
AKA Old Houseboater