G'day guys am about to start a ls1 swap in my 66 Impala now I would like to make all the lights in the dash still work like the hot/cold temp gauge , oil pressure , generator and speedo. I also have mechanic oil temp and volt mount under the dash that will also need hooking up to the ls1 is it possible to have them all working.
and what parts will I need for the speed to work again am running a 4le60 trans.
If you're going to rewire all of that anyway and want to monitor as much info about your new engine as possible, look at a Dakota Digital instrument cluster for your car. It will be the cleanest way to see all of the info you want without a bunch of gages stuck all over the inside of your car.
You can double up on some of the gauges and the factory sending units (such as the mechanical oil temp and pressure gauge) by tapping into the block with a T fitting to share access to oil (though it would be easier to use a block of aluminum machined to accept a sending unit and the temperature gauge bulb and install it in your oil cooler line). Can do the same for coolant with a piece of exhaust pipe and a threaded fitting welded inside of it to splice into the radiator hose for your dash temp light. Generator will still work as the car has no idea what motor the alternator is bolted to and that is part of the charging circuit.
Speedometer will be an issue if you have an electronic sending unit for the speedo. If you have an older one piece case 4l60 transmission you can press on a gear on the out put shaft off of a truck (they retained a mechanical speedo long after cars switched over to electronic speedos). If it is a later two piece case 4l65 then you have to buy an electronic motor to drive the speedometer cable using the sending unit out signal.
I did this and regretted it; because of the expense (over $550 for the kit), and the fact that I mounted it under the car. Turns out it isn't water proof and has to be mounted somewhere under the dash; but the instructions failed to mention this little detail.
Did explain why I had such a bear of a time fabricating a mounting place at the end of the speedo cable (no room with big exhaust pipes) under the car.