[Homerr]

I'm starting a build on a 1975 MG Midget with a tired old motor and I'd like to see if I can improve emissions along the way as I rebuild it and replace/upgrade related items.

Are there any, say, sub-$200 tailpipe sniffers around for home use? I figure it doesn't need to be super accurate or registered for government use, so maybe there is a cheap one out there now. As I understand it there are six things to measure for, if a sensor could hit half or more that would be great.

I'd also be willing to weld in an exhaust bung for a sensor for some sort of hand-held unit in the passenger cabin. But this car will otherwise be 'old-school' and sans any EFI or ODB type equipment.