making of a cluster

hi i like to make a car cluster and to make the rpm im using a bi-polar motor so i buy SN754410NE to drive i also buy a digital to analog ic to read the rpm and convrt it to analog
can anyone help with a code to run it and maybe remove the digital to analog ic
thanks for any help

hi i like to make a car cluster and to make the rpm im using a bi-polar motor so i buy SN754410NE to drive i also buy a digital to analog ic to read the rpm and convrt it to analog
can anyone help with a code to run it and maybe remove the digital to analog ic

what is a car cluster?
For the RPM why not find an encoder to track the rotations.

"instrument cluster" is what i think he meant.

encoders are not as rugged as motors, as they don't fair well under the hood of a car.

i've made a dash board before, and the code is out there. look at the datasheet for the digital-analog converter for basic circuit ideas. also, look into a frequency-to-voltage converter. using that, you could tie into the existing coil ignitor circuit. no moving parts at all.