I have a Pi System 3 available that was used with the corses in the late 90's. It is a digital dash that comes complete with a full wiring harness that utilizes the stock sensors, plus has front and rear suspension sensors, full data logging capabilities, lap timing etc ...... it's in perfect condition and has not been used for 7 years. It runs from a P8 ECU and is complete with a mounting system for the dash/P8 etc. P8 is not included but I do have one if needed.
Remove all your existing harness, switches etc and fit this baby ... looks and is ultra trick.
New, these were over $10K. I am asking $1500.
If you consider that you will most likely pay well over $700 for the corse tach you are enquiring about, if you can get one, and that they have a tendency to quit, quite often, this Pi is an absolute steal.