Nonono. You want a NICE one. Size of a lipstick with a small control box you have in the trunk:
It can be had at Summit and others. You can see how to install it here.
Turning the Tach with Rev limiter TDC
It is VERY bright and you can set the rpm it goes off at with by inserting different 'beans' into the control box. In the pic above you can see the 3.0 bean, which is used for testing at 3000 rpm.
George