Tach install

[rbsileighty]

OK... i've heard a lot of different stories on this, so i'd like to get it cleared up. What is the deal with wiring in the factory tach. I would like to use the 240's factory gauge pod (out of a 91-94) and use it's tach and speedo.

I looked on autometer's site and they say their tachs work for 4, 6, and 8 cyl motors... I don't see why the factory one wouldn't work for the RB (when using the KA24DE tach). I don't have the harness in front of me, but I'd assume it's hookup wouldn't be much different for the stock tach vs the autometer tach (both getting the same signal). I also noticed autometer makes an adaptor:

One of the best additions to the Auto Meter lineup in some time has been the Tach Adapter, model number 9117. This small device is capable of integrating an Auto Meter tach into the electrical system of most late model vehicles. Without going into great detail, here is a brief overview of how it works and what it does. On every vehicle that has a distributorless ignition or even the newer coil on plug ignition system, there is a power supply that is fed to the coil(s). This is how and where the Tach Adapter connects, and how the engine RPM is determined. It connects to the power ‘feed wire’ and senses or sees the current draw each time the coil is energized to fire, in turn allowing a frequency to be calculated, and ultimately a tach to be connected. This device sees that current draw and provides the tach with its reading for engine RPM. It is rather simple to connect, as it only needs to be connected to the power lead for the coil(s), have a ground connected, and then the remaining wire is for the tach to connect to and show you the engine RPM. Now, keep in mind, this is a solution for many vehicles, not all, and technology is always changing, so you can always check with us or our website for the latest information.

I was wondering if this might fix any adaption problems?

As far as the speedo goes... would the electronic sender fit where the manual sender comes out of the RB20's trans?

Thanks for the help!

Sig