Citrus..Well bought car! ...Congrats! Go ahead... just add an original tach! Since it doesn't have the original motor, you have some flexibility in how you want to finish it. An original tach would be a nice option...IMO. You would need to change out the dash harness/ front harness or perform the U14 wiring conversion shown here... http://www.nastyz28.com/2gcog/tech/u14swap.html Can't wait to follow your progress. Keep us posted...and take tons, I mean tons of high quality pics to document your work!