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How to wire tachometre mgb gt 1972 - Cars & Trucks

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The tach goes to the power and the ground and the signal lead goes to the negative terminal of the coil.

Posted on Nov 06, 2012

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Posted on Jan 02, 2017

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Edward, Firing order 1-3-4-2 for spitfire. Check the attached links,instruction and guides, Good luck
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Mate this is a link to a wiring diagram for 1972 dodge challenger, They're saying It is wise to first read to understand the wiring schematic before making any wiring changes on your Dodge Challenger to avoid any wrong wiring connections. By-the-way, you can clink on the diagram to enlarge the image and clink on it again to see which wires are the right colours, CHEERS..
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The only way the engine would keep running smoothly (not engine pre-ignition running) is that the coil is still getting power. If you look at the coil you will see the supply side of the coil comes from the start switch. There is where you should "start" checking. I recommend you also check the start relay for sticking. Something in the starting circuit is not cutting off the voltage to the coil...allowing power to the distributor points.

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1 Answer

How to wire in my tachometre on my mgb gt 1972


your tacho should have 4 wires 1 black =ground 2 green=ignition 3 white/black =ignition coil contact breaker side 4 red=illumination make sur your tacho is for the correct system ie. pos or neg ground

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1 Answer

I connected the wires to the head light switch on a 72 mgb and the black wire melted real bad. How do i find out what wires go where


You need a wiring diagram. Use a multi meter to find which terminal on the switch gives power (12volt) black wires are always negative (-) SO WILL BURN IF CONNECTED TO POSITIVE (+12V) supply.

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Have you removed the cable from the air direction control on the dash? You have to pull the cable out with the heater unit, and that means bending it through quite a severe angle, which means tugging on the heater unit. There is also a rubber block on the back of the heater unit at the bottom which fills the space between the heater unit and the bulkhead which also makes it harder to lift out (but even harder to get back with a new block!). Other than that it is 'just' a matter of pulling it up and leaning the top forwards to clear the body above it. For a pictorial blow-by-blow of removal and replacement see http://www.chicagolandmgclub.com/photos/b_heater/

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http://www.mgb-stuff.org.uk/

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