HELP !!! Wiring a RPM gauge ?

Hi fellas
I got a rpm gauge from so-cal speed shop and it miss the instruction manual.
How do I wire it ?
As pic show it has a 4 pin connector numbered 1 2 3 4.
The number 1 flat is missing.

 

Looks used. You bought it from So-Cal?
What make and model is it?

the three pins are probably +12V, ground, and ignition (sense) -- but need to know make to say which is which.

 

Bought it brand new from so cal , the box miss the papers and the box and gauge doesn't show any kind of brand exept so cal speedshop.

 

You call So-Cal Speed Shop and tell them the tachometer they sold you is defective and get it replaced, and tell them to send you one with directions this time too.

 

I will asap

 

I think those are made by Classic Instruments. The connections according to their online installation instructions are:

Terminals.

1-switched power
2-ground
3-trigger

 

Scratch that. Just looked at the pic again and numbering seems off.

 

Called them and they will mail me the wire diagram, anyway i just got it all together and can swith the rpm wires when I get the answer.
Thanks guys

 

let's see what the front side looks like. quit teasing us with pics of the back side

 

Here it is, nothing ultra rare super special but nice anyway.
Would be fun to give the gauges new homemade faces.

 

Kudos on a bad ass wiring job! - nice gauges too

 

This is way long ago, but did you ever receive the wiring diagram for that tach? I have the same one with the same issue!

 

Hey folks, sorry for digging up a topic this old, but I found this one on Google because I had the exact same problem.

I stumbled across these two manuals and I figured it's worth posting them even though this is quite an old topic... because I consider them very helpful.

Hope it's gonna be useful for somebody.

 

Already useful to me so thankyou! I didn't notice I had dipswitches on my newly installed SoCal tach and the mismatch between the tach rpm and my timing light rpm is on my snagging list. Thanks again!!

Chris