Size of drill bit required to install OPS sensors in rear bar?

[pontiff]

Hi all,

Quick one for those that have attempted to install OPS. The instructions (i just have the kaufatec ones for a jetta, but same size sensor in the polo) talk about drilling a 3mm hole from the inside then using a 'forstner' bit to drill out the hole for the sensor, but it neglects to say what size the forstner drill bit needs to be.

I don't have the kit handy to measure the sensor size, but has anyone done it and knows? Are they readily available?

[Umai Naa!!]

Use a spade bit, or a Uni-bit (Step drill). I think it's 26mm, but you'll need to measure the sensor to confirm.

You can use a holesaw and auger, but they're usually messy.

[wai]

The best thing to do is measure the sensor.

I have some aftermarket ones fitted to my Hiace, and the guys used a hole saw. I asked them why they did not use a large drill and the answer came back that it was easier to control the bit on a holesaw than a large drill. The large drill tended to produce a more "ugly" hole.