I had a 30 year old dwell/tac/battery meter just like this that finally wore out. I found this one on Amazon at a great price. It works perfectly, and is ideal for my older cars that use timing lights and have adjustable timing.

Very good budget meter. Works great, fairly accurate for an analog meter. Reasonable price.

I needed a basic Dwell/Tachometer to tune my car from the '60s and this one works just fine. Only complaints are the allegator clips you use to hook the unit to the car are very flimsy. I suspect they will need to be replaced at some point. You need to read the dial carefully. There is no 4/6/8 cylinder switch, so you have to be careful to read the correct scale for your car. So, decent value for the price but not a knockout value.