This research is focused on biogas production from two substrates; cow dung and tomato waste for co-digestion process. A laboratory digester was constructed in the form of modular digester. The pressure reading indicates the presence of gas which confirms that it is possible to produce useful gas from slurry and vegetable waste mixed together. In an instance where this waste was not collected and digested, it is sure that there would be emission of gas into the atmosphere. With the waste management process, the gas emissions and smell intensity is reduced. Although this was done in a small scale because of research purposes, it can also be done in large scale for commercial purposes based on preference. The production was carried out with a pressure gauge during the construction of the digester. This serves as an alternative for gas collection in a gas holder/ tyre tube which is a more efficient way of detecting the presence of produced gas in the system. For faster yield of gas, the production was done in a thermophilic condition, at higher temperature range. Adequate methane gas was produced with co digestion of substrates at balanced ratio of mixture.