ae71 running aftermarket rpm gauge

[antman89]

hey guys hooked up a rpm gauge that i got for my car just a 52mm mechanical needle one hooked it up using the generic directions but when i run my car it bounces all over the shop and is so delayed unsure how to fix this or should i just got get a digital one or standard tacho dash

- running acc power from stereo affect this?
- ground to car instead of at battery cause this?
- not hooking up power for lights affect this?

thanks any help will be appreciated wires are my best friend

[haveaparty]

Hook acc and batt wires to ur ignition. And the rpm wire to positive on coil. And make sure u got a good solid ground. And make sure on the back on the gauge that it's selected on 4 cyl not 6 or 8

[slide86]

the rpm signal wire goes on the NEGATIVE of the coil......not the positive

[antman89]

running power to igniton and good ground and running to negative coil wondering if i just run it straight off battery will make a difference

[haveaparty]

Well there u go hahaha. I just trial and error for that usually lol