Tach install help

The Tach should have a magnetic pick up. If your putting on a Dodge use the crank bolts for your pick up points. You need 4 pick up points per rev. I hope this helps you....I might have some pics of one I did, I'll look.
 
will the crank bolts actually work - xI thought that the bolt heads were too wide??
I could use the Ford pickup or dodge pickup to read those and use a 4 cylinder tach
 
Use the four bolts unless it says to do otherwise. The corsa systems use seperate magnets that you put on the dampner, you can use 2-4 magnets on those but most tachs require 4. And we always use the bolts.
 
OK, i got these sensors and they have a red and black. What do i need to do to hook it up to the tach. Which one goes to the signal wire?
 
use the cherry gs100701. this does not require a magnet on the crank. you will need to place a resistor from the output to 12volts though. start with 10k and lower to 2.2k if needed.
 
so i cant use these sensors i bought? i dont mind using magnets. What happened to using the bolts on the crank?
 
well i can't find a datasheet on this sensor anywhere but it says two wire which would make it a variable reluctance sensor like off the axle on most trucks. i do not think it would work for most tachs. a VR sensor is variable amplitude and frequency so at idle or low RPMs the signal could be 100millivolts or less.
 
3wire and 12volt output is what most tachs need which is not what most 3 wire sensors are. you can use those tach adapter boards from enterprise to convert a 5volt 3wire sensor to a 12volt.

the one i said to use is an open collector output which requires the pullup resistor to 12volts (or any voltage) to work correctly. i have not tried it but i would bet it would work for the stock dodge tach as well.
 
I alread have one of those filter boxes enterprise sells. you think it might work with that? And the PPR is adjustable.
 
FWIW, I hooked up my Stewart Warner Tach (114117) to their 82646 speed sensor tonight. It's a two wire so I wired one wire to 12v+ and one wire to coil sense wire on the tach. It's triggered at 6 PPR off the torque converter bolts and works great!

Here's the sender on their site.
Stewart Warner Performance
 
I didn't want to say anything until now so that I didn't put my foot in my mouth but I have a GUS working with a 3 wire proximity switch. I am running a cheap 3 wire switch with power and ground going to it and the 3rd wire coming to the signal on the GUS. I am using the stock balancer aiming it at the 2 notches on the outside edge. I will get some part numbers and pictures if anyone wants them.
 
Update:

Well I went and put my foot in my mouth. I thought that I had the tach working it dies after 2000 rpm. So to try and fix it I moved the sensor from the outside of the balancer to pointing at the bolts. This did make it better but still no dice. At first it would only go to 2500 rpm, after closing the air gap up some it will read to 3900 then falls off.

I think I need a faster switch. Why can't anyone make a stand alone tach?
 
JerrodGlover said:
Update:

Well I went and put my foot in my mouth. I thought that I had the tach working it dies after 2000 rpm. So to try and fix it I moved the sensor from the outside of the balancer to pointing at the bolts. This did make it better but still no dice. At first it would only go to 2500 rpm, after closing the air gap up some it will read to 3900 then falls off.

I think I need a faster switch. Why can't anyone make a stand alone tach?
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They do. Buy the instrument cluster out of a gasser!
 
Would love to Dan but it still has no recall and most of my factory wiring and computer fell out somewhere.
 
seriousdiesel said:
Here's the pictures and info I promised:

The proxemity sensors i used were used sensors off ebay. They are normally closed inductive proxemity sensors. The proxemity sensors have 3 wires. Blue is ground, Brown is 12v Ignition, Black will go to the pickup wire on the tach (the one that would normally go to the coil on a gas vehicle). Wire the rest of the tach according to the instructions, set it to the V8 setting (which would be 4 pulses per revolution) and enjoy your new kick ass tach.

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Found this in some old posts. Sounds like what I tried to do but didn't get to work. Maybe I have the wrong sensor.
 
JerrodGlover said:
Would love to Dan but it still has no recall and most of my factory wiring and computer fell out somewhere.
Click to expand...

Doesn't summit make a recall box? Also don't you have a data logger? Does your organization require proof of RPM?
 
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