Multiple systems on the same account

Does anyone know of a strategy tester that allows for 2 or more systems to be back tested on the same MT4 account? I know Zulu and Myfxbook have their own simulators were 2 or more signals can be added so they can be trialled as a combo rather than individually but I am thinking about MQL5 signals or my own.

well, this is is called strategy (basketing) or in other words a basket of strategies or signals!

we as quants love this btw

your simplest option is to combine all strategies into one and backtest them as one strategy using ur mt4/5

but if you want to take things further, you can always use the methodology pro traders prefer, give weights to each strategy or signals based on its signal strength;
for example, if we are trading eurusd, and one of the strategies gave me buy signals while the other gave us a sell signal at the same time! your broker might block the 2nd trade (hedging not allowed) or you might end up doubling your losses.
in this case, I would give a weight to each strategy based on strict criteria that could be gain of strategy 1 vs. 2; which can be for example strategy1 ---> 75% weight and 25% strategy2 weight. in this case, I will go with the signal provided by strategy1


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if you need to go even further, I would suggest that you apply your strategy in python and backtest it using any backtesting framework such as backtrader or zipline (i would go with backtrader) as it is easier to learn and to apply.
once you are there, basket your strategies and optimize them in backtrader for the best variables (weight).

there are many ways to connect python to mt4

In general, it is possible. But most likely it should be tested on a demo first, because it can lead to serious consequences or losses, because signals in opposite directions on the same asset can both indicate the potential for profit and can both close in minus and you will face stress and financial losses, etc. So you can give it a try. But I would probably follow some more traditional approaches, because it's really safer and it can provide some stability in your work. Although every trader can choose exactly what he likes because that's why we come into this business and why we stay here.