tach hook up

geojoh · 08-19-2007, 05:06 PM

I have an autometer tach that I want to hook up to RAMJET motor with a stock late model ignition system. Where can I tap into the ignition system to pick up the pulse that that will drive the tach to the engine RPM?

Thanks, geo

taillight · 08-19-2007, 05:52 PM

Please tell what the year, engine size, make and model of engine.

geojoh · 08-19-2007, 07:43 PM

The engine was purchased in a crate from a chevy dealer. It is a chevy 350 ci Ramjet. It is installed in a 1970 Chevy II I think RamJet first came on the scene in about 1996.

Thanks, geo

taillight · 08-20-2007, 08:42 AM

If it is a 1970 distributor look on the top of the distributor cap. One terminal is marked Batt the other is marked Tach.

silicon212 · 08-20-2007, 11:49 AM

Quote:

Originally Posted by taillight

If it is a 1970 distributor look on the top of the distributor cap. One terminal is marked Batt the other is marked Tach.

Not on a 1970 distributor. Only on HEI, which came into being '74-'75.

geojoh · 08-20-2007, 12:10 PM

The iginition system is the one that came on the RAMJET motor when it was purchased about 3 years ago. It is not an HEI system it is a generation or two newer that HEI.

Thanks, geo

777stickman · 08-20-2007, 09:07 PM

1. RED wire to 12v ignition source
2. GREEN wire to NEG side of coil.
3. BLACK wire to good GROUND.
4. WHITE wire to instrument panel lights source.

geojoh · 08-22-2007, 06:23 PM

The last post looks like the wires coming off the tach not the wire, from the ignition system, I need to hook to the green wire from the tach.

The coil for the ignition systen that came on the RAMJET engine has two connectors on it. A grey one with pink and a white wire. A black one with a green and a red wire. I believe the grey one comes from the distributor.

So now where do I hook up the green trigger wire that comes off the tach?

777stickman · 08-22-2007, 07:13 PM

Quote:

Originally Posted by geojoh

The last post looks like the wires coming off the tach not the wire, from the ignition system, I need to hook to the green wire from the tach.

The coil for the ignition systen that came on the RAMJET engine has two connectors on it. A grey one with pink and a white wire. A black one with a green and a red wire. I believe the grey one comes from the distributor.

So now where do I hook up the green trigger wire that comes off the tach?

This is speculation only. I don't have a clue as to what you have for an ignition sytem. So, disconnect both connectors and probe all 4 contacts for 12v ignition voltage, probably the red one. Do not hook the GREEN tach wire to this one. You have 3 left. Good luck...........Steve

Please post back which color wire worked so that others can see the results.

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