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I have my 84 T-Type but my factory RPM gauge is very inacurrate. I wanted to buy a Tach, nothing fancy just a simple 4 wire tach (Sunpro). What is a good source of tach signal. I've installed 2 tachs before on 2 other cars but they were carburated. I know that there is a green clip under the hood that is not connected, I've heard this is also a tach signal but not sure. Can anyone give me hits. Thanks.

red - positive
black - ground
white - light
green - tach signal
 

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aka: mOtOrHeAd MiKe
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cesar:


red - positive
black - ground
white - light
green - tach signal
Yep, that 2 white wire/green clip is the tach signal. Note: The tach signal is 5.5V, not 12V like most normal cars. You may need to talk to John Spina @ Caspers for a module to convert this.

HTH,
 

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just hooked my autometer tach up yesterday.works no problem.thanx steve.all i did was ran the tach lead to the green plug.probably the same thing for your 84 :D
 

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Is there a converter needed to hook up the tach??
OR do you just hook up the tach using the provision behind the alternator...
(i.e.: "A Lick and a Promise")

dunno Confused,
Jim
 

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all i did was run my tach lead to that green plug and that was it.works perfectly
 

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Steve Wood:
Never heard of a converter. Some of the vdo tachs were looking for a different waveform and needed a mod to them. Don't recall if it was a diode or a resistor...Seems like the little tach would not work straight out of the box.
Yep.

I got the unit from Caspers for my VDO tach.
 
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