Nicely done Meg. Way easier than I was imagining, and can all done with dash in place, what with placing the ammeter in the removable radio blanking plate.
Lou, at the risk of stating the obvious, you may need to modify Meg's wiring location a bit (assuming your car is LHD).
The 'Lucar' connectors Meg refers to are typically called 6.3 mm blade connectors on the supplier sites I provided earlier.
I would recommend using a combination of uninsulated blade connectors and the associated multiple block connectors and insulation sleeves. The uninsulated female blade connectors can be covered with insulating sleeves at the gauge. The two block connectors could be used to connect to the cut main wire between the Control box and solenoid. As Meg mentions, if the two block connectors are connected opposite directions the ammeter install can be easily reversed. The multiple block connector I mean is shown here in the single conductor or "one way" version you would require.
http://www.autoelectricsupplies.co.uk/p ... category/7The male and female blades in the connectors have a small tang on them. They are crimped and then inserted in to the terminal block. There are two tools available that allow the removal of the terminals from the plastic blocks if required. Note the male blades are extended length to fit in the block.
The reason I recommend these connectors is they use a double rolled crimping method that is very secure and does not require solder. The terminals are available in several sizes to accommodate the large wire you require.
You will also see insulated connectors on the sites. They are the ones commonly available here at Canadian Tire and so forth. They crimp on the wire without a double roll and typically don't have a separate crimp to hold the insulation securely. I find them way less secure than the double rolled type I am recommending.
Here is the type of crimping tool required if you use the recommended connectors. The series of pictures shows the crimping action very well.
http://www.autoelectricsupplies.co.uk/p ... ategory/87I have not found an easy source for the double rolled type of terminals here in Canada, and have therefore found the two overseas suppliers the easiest solution.
Sorry for length and apologies if this is all obvious. Just that the unfused ammeter circuit has to be 100% secure and durable, and very well insulated.
HTH
Stu