with an aftermarket guage

or lots of #OOPS#ing around by someone that knows alot about electrical systems, and in the end you have a tacho thats not that accurate and slow to react

i always found it funny when i had the stock tacho and the autometer one in my sedan, coz im that col i needed 2 tachos, you could quite easily see the different in the readings and how much slower the stock one was to climb